Monsieur de Montcalm, an able officer, who succeeded Dieskau in the command of the French troops in Canada, sought to compensate by superior activity, for the inferiority of his force. While the British and Americans were adjusting their difficulties respecting rank, and deliberating whether to attack Niagara or fort Du Quesne, Montcalm advanced at the head of about five thousand Europeans, Canadians, and Indians, against Oswego. In three days he brought up his artillery, and opened a battery which played on the fort with considerable effect. Colonel Mercer, the commanding officer, was killed; and, in a few hours, the place was declared by the engineers to be no longer tenable. The garrison, consisting of the regiments of Shirley and Pepperel, amounting to sixteen hundred men, supplied with provisions for five months, capitulated, and became prisoners of war. A respectable naval armament, then on the lake, was also captured. The fort at Oswego had been erected in the country of the Five Nations, and had been viewed by them with some degree of jealousy. Montcalm, actuated by a wise policy, destroyed it in their presence; declaring at the same time, that the French wished only to enable them to preserve their neutrality, and would, therefore, make no other use of the rights of conquest, than to demolish the fortresses which the English had erected in their country to overawe them. The British general, disconcerted at this untoward event, abandoned all his plans of offensive operations. General Winslow was ordered to relinquish his intended expedition, and to fortify his camp, and endeavour to prevent the enemy from penetrating into the country by the way of South bay, or Wood creek. Major general Webb, with fourteen hundred men, was posted at the great carrying place; and, to secure his rear, sir William Johnson, with one thousand militia, was stationed at the German flats. These dispositions being made, the colonies were strenuously urged to reinforce the army. It was represented to them that, should any disaster befall Winslow, the enemy might be enabled to overrun the country, unless opposed by a force much superior to that in the field.[154] [Footnote 154: The northern colonies had been enabled to attend to these representations, and, in some degree to comply with the requisitions made on them, by having received from the British government, in the course of the summer, a considerable sum of money as a reimbursement for the extraordinary expenses of the preceding year. One hundred and fifteen thousand pounds sterling had been apportioned among them, and this sum gave new vigour and energy to their councils.] [Sidenote: Small-pox in Albany.]