French and Indian War
British campaigns, 1755

The British formed an aggressive plan of operations for 1755. General Braddock was to lead the expedition to Fort Duquesne, while Massachusetts governor William Shirley was given the task of fortifying Fort Oswego and attacking Fort Niagara. Sir William Johnson was to capture Fort St. Frédéric at Crown Point, New York, and Lieutenant Colonel Robert Monckton was to capture Fort Beauséjour to the east on the frontier between Nova Scotia and Acadia.

Braddock led about 1,500 army troops and provincial militia on the Braddock expedition in June 1755 to take Fort Duquesne, with George Washington as one of his aides. The expedition was a disaster. It was attacked by French regulars, Canadian Militiamen, and Indian warriors ambushing them from hiding places up in trees and behind logs, and Braddock called for a retreat. He was killed and approximately 1,000 British soldiers were killed or injured. The remaining 500 British troops retreated to Virginia, led by Washington. Washington and Thomas Gage played key roles in organizing the retreat—two future opponents in the American Revolutionary War.

The British government initiated a plan to increase their military capability in preparation for war following news of Braddock's defeat and the start of parliament's session in November 1755. Among the early legislative measures were the Recruiting Act 1756, the Commissions to Foreign Protestants Act 1756 for the Royal American Regiment, the Navigation Act 1756, and the Continuance of Laws Act 1756. England passed the Naval Prize Act 1756 following the proclamation of war on May 17 to allow the capture of ships and establish privateering.

The French acquired a copy of the British war plans, including the activities of Shirley and Johnson. Shirley's efforts to fortify Oswego were bogged down in logistical difficulties, exacerbated by his inexperience in managing large expeditions. In conjunction, he was made aware that the French were massing for an attack on Fort Oswego in his absence when he planned to attack Fort Niagara. As a response, he left garrisons at Oswego, Fort Bull, and Fort Williams, the last two located on the Oneida Carry between the Mohawk River and Wood Creek at Rome, New York. Supplies were cached at Fort Bull for use in the projected attack on Niagara.

Johnson's expedition was better organized than Shirley's, which was noticed by New France's governor the Marquis de Vaudreuil. Vaudreuil had been concerned about the extended supply line to the forts on the Ohio, and he had sent Baron Dieskau to lead the defenses at Frontenac against Shirley's expected attack. Vaudreuil saw Johnson as the larger threat and sent Dieskau to Fort St. Frédéric to meet that threat. Dieskau planned to attack the British encampment at Fort Edward at the upper end of navigation on the Hudson River, but Johnson had strongly fortified it, and Dieskau's Indian support was reluctant to attack. The two forces finally met in the bloody Battle of Lake George between Fort Edward and Fort William Henry. The battle ended inconclusively, with both sides withdrawing from the field. Johnson's advance stopped at Fort William Henry, and the French withdrew to Ticonderoga Point, where they began the construction of Fort Carillon (later renamed Fort Ticonderoga after the British captured it in 1759).

Colonel Monckton captured Fort Beauséjour in June 1755 in the sole British success that year, cutting off the French Fortress Louisbourg from land-based reinforcements. To cut vital supplies to Louisbourg, Nova Scotia's Governor Charles Lawrence ordered the deportation of the French-speaking Acadian population from the area. Monckton's forces, including companies of Rogers' Rangers, forcibly removed thousands of Acadians, chasing down many who resisted and sometimes committing atrocities. Cutting off supplies to Louisbourg led to its demise. The Acadian resistance was sometimes quite stiff, in concert with Indian allies including the Mi'kmaq, with ongoing frontier raids against Dartmouth and Lunenburg, among others. The only clashes of any size were at Petitcodiac in 1755 and at Bloody Creek near Annapolis Royal in 1757, other than the campaigns to expel the Acadians ranging around the Bay of Fundy, on the Petitcodiac and St. John rivers, and Île Saint-Jean.
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