This year had arrived at Quebec from France a large body of regulars, under the command of the MARQUIS DE MONTCALM, with the Brigadier de Levi, and Colonel de Bourlemaque. Montcalm remained but a few days at Quebec, and then hastened on with his veteran re-enforcements to strengthen the force destined to act against Oswego. Rigaud de Vaudreuil, with a large body of Canadian militia raised at Montreal, was detached as the vanguard of the army, and arrived undiscovered on the 9th of August within a mile and a half of the British position; on the night of the 10th the first division also arrived; on the 12th, at midnight, the second division joined. Then the French chief, having made all necessary preparations, opened his trenches before Fort Ontario,[74] which was situated at the opposite side of the river from the important position of Oswego. From break of day until six in the evening Montcalm kept up a heavy fire, which was vigorously replied to by the defenders; then, however, the resistance suddenly ceased. The unpardonable neglect of the British authorities had left this important post almost unprovided with ammunition, and in the hour of extremest need the scanty supply failed. Further defense was impossible; the survivors of the little garrison spiked their cannon, and retreated without interruption to the neighboring position of Fort Oswego, on the opposite side of the river. When the French perceived that the defenders had yielded the post, they quickly took possession, and turned such of the guns as in the hurry of retreat had been still left uninjured upon the walls of the remaining stronghold. The defenses of the feeble fort soon crumbled beneath the crushing fire from Montcalm's battering train and the now hostile guns of Fort Ontario. Colonel Mercer, the English chief, and many of his men, were struck down, and the remainder, hopeless of a successful defense, surrendered upon not unfavorable terms on the evening of the 14th of August. Seven armed vessels, mounting from 8 to 18 guns each, 200 bateaux, a vast quantity of provisions and warlike stores, with 1200 prisoners,[75] were gained by the victors; and for a brief space, several British flags, the unwonted trophies of French conquest, decked with drooping folds the walls of the Canadian churches. This brilliant and important success was, however, stained by cruelty and doubtful faith.[76] Notwithstanding the terms of the capitulation, the savages were permitted to plunder all, and massacre many of the captives;[77] and, to the shame of Montcalm, the sick and wounded who had been intrusted to his protection were slain and scalped under the Indian knife. The remaining prisoners, however, were escorted to Montreal, where they were treated with kindness and consideration, and soon afterward exchanged.[78] The French, having demolished the works at Oswego, returned to the eastern part of the province.