Despite efforts to keep the war from spreading to Europe, Great Britain signed a defense treaty with Prussia against France (and Russia) on 16 January 1756. In response, France signed a pact with Austria (who was already in league with Russia) and later Sweden and Saxony. The French invaded Minorca, a Mediterranean island off the coast of Spain, at the time held by England. Then, on 15 May 1756, Great Britain formally declared war on France. The conflict, in its European stage, would be called the Seven Years War.
After his campaign against Fort Niagara failed, General Shirley returned to New York to formulate plans for the next year’s course of action. The plan he devised was to launch another campaign to capture the French forts at Niagara, Frontenac and Toronto on Lake Ontario; to capture the forts at Ticonderoga and Crown Point on Lake Champlain; to make a second attempt to take Fort Duquesne on the Ohio River; and to invade the region around Quebec.
There was only one small problem with Shirley’s plan: in order to accomplish it all, the English colonies would have to raise a militia of over sixteen thousand men. The colonies balked at the idea. Pennsylvania and Virginia outright refused to participate in it because the Indian depradations on their frontiers were taxing their abilities to raise the militia even for their own immediate defense. Initially, the New England colonies were not too keen to finance another expedition against Crown Point so soon after the first one ended in failure. But after they learned that Parliament was willing to provide some compensation for the debts incurred during the campaign of 1755, they decided to take another chance on General Shirley’s plan. The only condition they placed on Shirley was that the militia that would be raised in New England were to be utilized solely on the planned attacks on Ticonderoga and Crown Point.
The English constructed new fortifications in the Mohawk Valley during the late winter months of 1756; they were intended to guard and facilitate the transport of supplies to the forts at Oswego. One, named Fort Williams, was located on the Mohawk River at the Great Carrying Place between the Mohawk and Wood Creek. Another, Fort Bull, which was more of a palisaded storehouse than a fort, was constructed four miles from Fort Williams along Wood Creek. To the southeast of these two forts, in the valley known as German Flats, the farmstead of Nicholas Herkimer was fortified.
During the spring of 1756, both the English and French forces in North America received new commanders-in-general. On 11 May, Louis Joseph, Marquis de Montcalm-Gozon de Saint-Veran arrived in Canada to take command of the French armies. At about the same time, word was received by General Shirley that he was to be superceded by Colonel Daniel Webb. Webb would later be superceded by General James Abercrombie, who subsequently would be replaced by the Earl of Loudoun. On 23 July, John Campbell, Earl of Loudoun arrived to take command of the English armies.
Iroquois spies delivered messages to the governor of Canada at the time, Pierre Francois Riguad, Marquis de Vaudreuil, to the effect that the English were planning to renew the attempts made during the previous year against Crown Point and Niagara. In order to be better prepared if the Indians were right, Vaudreuil directed the fortification of Ticonderoga and the strengthening of the forts at Niagara and Frontenac. He likewise made plans to launch an attack on Fort Ontario, New Oswego and the Old Oswego (or Fort Pepperrell), known collectively as Oswego, located where the Oswego River emptied into Lake Ontario in order to obtain complete control over Lake Ontario. To that end, he would send the Marquis de Montcalm.
In February, prior to Montcalm's arrival, Vaudreuil dispatched Lieutenant Gaspard-Joseph Chaussegros de Lery with a force of three hundred and sixty-two hand-picked soldiers to reduce the forts blocking the pathway to Oswego. The force consisted of a mix of troupes de terre, or regular line soldiers from France, native Canadian militia and Indians. Early on a morning in late-March the French army approached Fort Bull. The French came suddenly upon a party of twelve English soldiers conveying three wagons of supplies for the thirty provincial troops who were garrisoning Fort Bull. Levy saw the opportunity and immediately rushed upon the fortified storehouse. The wave of French troops pushing toward the small fort almost made their way into the palisaded compound before the English could shut the gate. The French did not let that stop them; they poked their muskets through the loopholes in the walls and fired upon the English troops. Despite their desparate situation, the English would not yield to the French demands for surrender. For over an hour, the English pelted the French with bullets and grenades, and the French returned the fire hotly. Eventually the French were successful in breaking down the main gate of the fort, and they poured in. In the massacre that followed, only two or three English soldiers and one woman, who had hid when the fighting started, escaped death. Lery withdrew his men after setting fire to the fort, destroying a large part of the supplies intended for Oswego.
After his arrival, Montcalm lost little time in asserting his intentions to end the war quickly by attacking the English held forts at Oswego and Fort George on Lake Ontario, and eventually claiming victory over them on 14 August. Montcalm's campaign against Oswego was put into action in as soon as the waters of the Saint Lawrence River became navigable for the summer. Coulon de Villiers was sent, in May, with a force of eleven hundred French troupes de terre, Canadians and Indians, to harass the forts at Oswego.
Lieutenant Colonel John Bradstreet was placed in charge of two thousand boatmen, divided into three divisions, to convey supplies from Albany to the English forces at Oswego. To that end, Bradstreet's convoy had made a trip with supplies for the forts in late-June. On three hundred and fifty bateaux, and with one thousand men, Bradstreet was able to complete the delivery of supplies to Oswego and thereby prevent the fort from collapsing due to starvation. The convoy was making the return trip up the Mohawk River, on 03 July, and had reached a point about nine miles from Oswego when, at about three o'clock in the afternoon, they received heavy fire from the depths of the forest on the east side of the river. It was Villiers' force of seven hundred Canadians and Indians.
From that first volley, a considerable number of men under Bradstreet were mowed down and some were taken prisoner. The French could have withdrawn with a victory to their credit, but they decided to pursue the English and claim more victims. To that end, they crossed the river to an island. Colonel Bradstreet was aware of their movement ahead of him. With only eight men, Bradstreet followed the French to the island where they maintained an harassing fire until more of the English troops could join them. When the number reached about twenty, they moved on the French, pushing them back a little. The English made another thrust at the French, who were beginning to sense the mistake they had made. The French made their way along the edge of the island looking for another place to cross the river. Bradstreet’s small party of twenty, by that time, had grown to two hundred and fifty. Leaving some of those troops to guard against the French doubling back and crossing downstream, Bradstreet took the rest and headed forward. The French were found among a stand of pine in a swampy area near the shoreline and the English opened fire on them. For nearly an hour the two forces fired at each other to little effect. Finally, Bradstreet urged his men to make an advance on the French. Villiers' Canadian and Indian troops were taken aback by the unexpected ferocity of Bradstreet's troops, and they fell back toward the Oswego River. Trapped, with nowhere to run, Villiers' troops jumped into the river in an attempt to swim out of Bradstreet's grasp. The English easily picked off large numbers, but because the river's swift current carried many of the bodies downstream, an accurate count of the dead could not be made.
A group of French soldiers made their way to the site of the battle with the intention of reinforcing their comrades. They, in turn, were set upon by Bradstreet's men and forced back across the river. English reinforcements arrived through the evening, and Bradstreet was emboldened to follow the French. But as day broke on the 4th, it began to rain; it poured so heavily that the Lieutenant Colonel changed his mind and ordered his men to continue their journey back to Albany.
John Bradstreet tried to encourage his superiors to concentrate their attentions on the reinforcement of the garrisons at Oswego. But the English high command was not listening to a provincial militia commander. James Abercromby, who had replaced Governor Shirley as commander of the English armies in North America prior to Loudoun's arrival from England, would not allow Bradstreet to attend the army's council of war held on 16 July. Abercromby's plan of action was to have Major General Daniel Webb march his regiment to Oswego, but he did not insist that Webb hurry to that end. As a result, Webb's regiment was still at Albany on 23 July when Loudoun arrived. Webb moved his army as far as Schenectady, only fifteen miles from Albany, and then spent two weeks arguing over provisions contracts. The English army under Daniel Webb finally resumed their march and by 14 August had reached German Flats and the fortified farmstead of Nicholas Herkimer. They would be too late to reinforce the garrisons at Oswego, because by that date the French had already procured the surrender of the forts.
Having been warned that the English were intending to increase the garrison at Fort Ticonderoga, Governor Vaudreuil devised a plan which called for feigning an attack on Oswego in order to draw off some of the enemy from Ticonderoga. If the feint worked, so much the better; it might develop into a real attack and the possibility of taking Oswego. Montcalm was recalled from Ticonderoga and arrived at Momtreal on 19 July. There he established a base at which a new army comprised of recruits from Quebec and other French provinces and Indians was organized. Indians from the Menominee tribe of the region to the west of Lake Michigan joined the French and became part of Montcalm's army.
On 29 July 1756, thirteen hundred French regulars, seventeen hundred Canadian militia, and a large number of Indians assembled at Fort Frontenac under the command of Montcalm. They headed southward and approached Oswego on the 3rd of August. Spies reported that the fort was neither well constructed nor garrisoned by more than six or seven hundred men.
Montcalm moved his first division to Wolf Island on the night of 04 August and hid there until that evening. When darkness again approached, Montcalm moved on to Niaoure Bay where he joined forces with Rigaud de Vaudreuil, brother of the governor on the morning of 06 August. Following behind Montcalm's division, a second division bringing supplies and eighty artillery boats, arrived at Niaoure Bay on the 8th. The army landed within half a league of forts at Oswego around midnight of the 10th of August. Under the cover of the darkness, the French set up four cannon on batteries and then waited patiently in their bateaux until morning.
An English soldier, reconnoitering the strand surrounding the fort, was surprised to find the French army so completely entrenched, and reported its presence to the rest of the garrison.
As daylight broke on the 11th of August 1756, the French began a general siege of the fortifications. The French and their Indian allies bombarded Fort Oswego and Fort Ontario throughout the day with musket balls and cannon balls. Twenty-two additional cannon were brought to the front of the French line, which was established at about one hundred and eighty yards from the forts, and contributed to the general bombardment of the fort.
Two English vessels on Lake Ontario attempted to silence the French cannonade, but their smaller caliber balls were no match to the heavier French artillery.
Throughout the 11th of August, while the siege was taking place, the French continued to strengthen their line. A trench was dug and a breastwork was erected out of tree trunks and brush.
Fort Ontario, constructed of tree trunks cut flat on two sides, and set upright into the ground closely together, stood on a high plateau on the east side of the river at the point where the Oswego River emptied into Lake Ontario. The garrison of three hundred and seventy holding Fort Ontario had eight small caliber cannon and one mortar for the fort's defense. They maintained a brisk fire at the French throughout the 12th and 13th, but once their ammunition was spent, their guns fell ominously silent. Headquartered at the stone structure of Old Oswego, which stood on the west side of the river, opposite to Fort Ontario, was Colonel Hugh Mercer the garrison's commandant. Mercer noticed the silence of cannon fire from Fort Ontario and correctly perceived that it was due to an end of ammunition. Although the French had not yet made any dent in Fort Ontario's wooden palisade, Mercer feared that if they correctly guessed the reason for the cessation of the fort's cannon fire, they might increase a bombardment of that structure. Mercer, therefore, signalled for Fort Ontario's garrison to abandon that structure and make their way to Old Oswego. The guns were spiked, and the troops left the fort, reaching Old Oswego relatively unmolested by the French and Indians.
To the west of Old Oswego, about a quarter of a mile distant, stood the unfinished structure officially dubbed New Oswego, but known by the names of Fort George and Fort Rascal. Prior to the arrival of the French, the stockade had been used as a cattle pen. Throughout the battle, one hundred and fifty New Jersey militiamen held the fort. Their contribution to the fight was minimal, though, due to the distance from Old Oswego and Ontario.
As darkness settled in on the evening of 13 August, Montcalm employed his troops at taking over the abandoned Fort Ontario. They constructed gabions to strengthen the walls and dragged twenty cannon (some of which had been captured in Braddock's defeat at Fort Duquesne) up the hillside to the stockade. Nine pieces of the artillery were in place by daybreak.
At daybreak, the Montcalm opened fire on Old Oswego from Fort Ontario. The heavy caliber cannon balls used by the French crashed through the stone and masonry walls of Old Oswego. And the English were caught offguard. Why Mercer would have thought that the French would not invest the abandoned Fort Ontario is anyone's guess, but not only did he fail to take that possibility into consideration, he had positioned his own cannon facing to the south and west, anticipating an attack by the French from the land in those directions. The bombardment that the French now gave to Old Oswego was intense.
In the course of the barrage, Colonel Mercer's body was ripped in two by a cannon ball. His men were giving a very spirited fight until that happened. But then the realization that their situation was all but hopeless set in and a council of the officers voted for capitulation to Montcalm. Lieutenant Colonel John Littlehales surrendered the fort to the French at 10:00am on 14 August. The English were assured safe conduct from the fort, but Montcalm could not control his Indian allies. Nearly one hundred of the fort's soldiers (including thirty who were in the fort's hospital at the time) and a number of civilians were massacred. In addition to the loss of the forts, the English lake fleet, including the ship, Oswego, surrendered to the French. The French, after plundering the stockades for supplies, set fire to all of the structures. The French now could claim control of all of Lake Ontario.
Through the autumn and winter of 1756, the English forces in the region were forced to retreat eastward. With the shift in power, many of the families who had settled in the Mohawk Valley fled to Albany and Schenectady. Montcalm moved the main body of his French army from Fort Carillon and Fort Frederick to Montreal and Quebec, leaving only small garrisons at each of the prior forts. The English army withdrew to New York, Boston and Philadelphia. In their retreat from the Mohawk Valley, the fortifications at the Great Carrying Place were destroyed so that the French would not be able to take advantage of them.
Despite the removal of the main English army from the region, raids against French posts were continued by Rogers' Rangers. Robert Rogers had raised a company of rangers in New Hampshire during 1755, and the successes of that company led him to raise another in the spring of 1756. So many New Englanders wanted to join Rogers' company of rangers, that he formed a second company by July, placing his brother, Richard, in charge of it. By the winter of 1756-57 nearly seven companies of rangers had been formed; they were in turn formed into a battalion under Rogers, who was appointed to the rank of major. Rogers and his Rangers harassed the French in the region of Lake George and Lake Champlain.
While the main English army was engaging the French in the frontier of the province of New York, colonial militias were defending the middle colonies from French incited Indian attacks. Commencing in the autumn of 1755, following the defeat of Braddock's army in the Battle of the Wilderness, and continuing on through the spring and summer of 1756, the Indians from the Ohio Valley, in particular the Delaware, launched raid after raid against the Euro-American settlers of Pennsylvania and Virginia. The largely Quaker General Assembly of Pennsylvania, previously uncommitted to participating in the defense of the frontiers, even of its own, now began to approve the raising of militia to combat the Indian incursions.
On 14 April 1756, Pennsylvania governor, Robert Morris issued a declaration of war against the Delaware. He stated that "Whereas, the Delaware tribe of Indians, and others in Confederacy with them, have for ƒome Time paƒt, without the leaƒt Provocation, and contrary to their moƒt Solemn Treaties, fallen upon this Province and in a moƒt cruel, ƒavage, and perfidious Manner, killed and butchered great Numbers of the Inhabitants, and carried others into barbarous Captivity; burning and deƒtroying their Habitations, and laying waƒte the Country...I have, therefore, by and with the Advice and conƒent of the Council, thought fit to iƒsue this Proclamation; and do hereby declare the ƒaid Delware Indians, and all others who, in Conjunction with them, have committed Hoƒtilities againƒt His Majeƒty's Subjects within this Province, to be Enemies, Rebels, and Traitors to His Moƒt Sacred Majeƒty; And I do hereby require all his Majeƒty's Subjects of this Province, and earneƒtly invite those of the neighboring Provinces to embrace all Opportunities of purƒuing, taking, killing, and deƒtroying the ƒaid Delaware Indians and all others confederated with them in committing Hoƒtilities, Incurƒions, Murders, or Ravages upon this Province..."
Following an attack by French and Indians on Fort Granville (present-day Lewistown, Pennsylvania), plans were formulated by the General Assembly of Pennsylvania to send a militia force to destroy Kittanning, a major Indian town. It was believed that if the Indians were shown that the war could be brought directly into their homes, it might serve to inhibit some of their depradations against the Euro-American settlers.
Kittanning was chosen as the militia's target because it was from that place that the Indian incursions generally originated. The Delaware chief, Captain Jacobs resided there, and occasionally the chief, King Shingas made his home there.
On 30 August 1756, Colonel John Armstrong, with a detachment of three hundred and seven men set out from Fort Shirley on the Juniata River and headed for the Indian town. Colonel Armstrong's report on the expedition was submitted to the Pennsylvania General Assembly as stated:
The attack on and burning of Kittanning had the desired effect. Although it did not completely stop the Indian incursions into the settlements of the Euro-Americans, it did contribute to a curtailment of the raids for some time.