Governor of New France, Pierre François de Rigaud, Marquis de Vaudreuil-Cavagnal, in May 1756 French and Indian raiding parties under the command of Louis Coulon de Villiers began harassing the Oswego garrison from a camp on Henderson Bay (south of present-day Sackett's Harbor, New York). General Louis-Joseph de Montcalm arrived in Montreal in May 1756 to lead the French army troops. He and Governor Vaudreuil took an immediate dislike to one another, and disagreed over issues of command. Concerned over the massing of British troops at the southern end of Lake George, Montcalm first went to Fort Carillon on Lake Champlain to see to its defenses. Vaudreuil meanwhile began massing troops at Fort Frontenac for a potential assault on Oswego. Following favorable reports from the raiding parties, Montcalm and Vaudreuil decided to make the attempt. Governor Shirley received word in March 1756 that he was to be replaced by John Campbell, 4th Earl of Loudoun. Loudoun's second in command, General James Abercrombie, only arrived in Albany in late June, and Shirley spent the intervening time shoring up the supply line to Oswego in anticipation of leading an expedition against the French forts on Lake Ontario. In June William Johnson traveled to the Iroquois headquarters at Onondaga, and successfully negotiated support for the British side with the Iroquois, Shawnee, and Delaware, forces that Shirley also hoped to use for his expedition. Shirley also hired 2,000 armed "battoemen", men experienced in sailing and shipbuilding. Under the command of John Bradstreet, these men successfully resupplied the forts at Oswego in July, although they were attacked by a French raiding party on their way back, suffering 60 to 70 casualties. When Loudoun arrived in Albany in late July, he immediately cancelled Shirley's plans for an Oswego-based expedition. Defenses at Oswego The complex of defenses at Oswego consisted of three separate forts. On the east side of the Oswego River lay Fort Ontario, a log fortification which was constructed in 1755, was sited on a rise overlooking the mouth of the river. It was garrisoned by 370 men from Pepperrell's Regiment, and was in fairly good repair. Fort Oswego was on the west side of the river, and had a central structure of stone and clay surrounded by earthworks to the south and west, but fully exposed to Fort Ontario, across the river. A recently constructed Fort George (called "Fort Rascal" by one of Shirley's