By this time Amherst's batteries had reduced Louisburg almost to defencelessness. The masonry of the fortress had crumbled under the concussion of its own guns and was little able to stand the shot of the British. A new battery erected on the hill to the north of the Barachois raked the western front of the French works from end to end, and there was no standing against its fire. On the 26th of July the last gun on that front was silenced and a practicable breach had been made. Drucour then made overtures for a capitulation. Amherst's reply was short and stern: the garrison must surrender as prisoners of war, and a definite answer must be returned within one hour. Drucour replied at first with defiance, but, before his messenger could reach Amherst he sent a second emissary to accept the terms; and on the following day the British occupied the fortress. The casualties of the besiegers were not heavy, little exceeding five hundred killed and wounded of all ranks. The loss of the French is unknown, but must have been very great, from sickness not less than from shot and shell. The number of soldiers and sailors made prisoners amounted to fifty-six hundred, while over two hundred cannon and a large quantity of munitions and stores were surrendered with the fortress. So Cape Breton, and Prince Edward's Island with it, passed under the dominion of the British for ever. The siege over, Amherst proposed to Boscawen to proceed to Quebec, but the Admiral did not consider the enterprise to be feasible. Drucour's gallant defence, indeed, had accomplished one object, in preventing Amherst from co-operating with Abercromby in the attack on Canada; though, could the siege have been begun at the date fixed by Pitt, his efforts would have been of little avail. Amherst therefore left four battalions to garrison Louisburg,[285] and sent Colonel Monckton, Colonel Lord Rollo, and Wolfe, each with a sufficient force, to complete the work of subjugation on Prince Edward's Island, the Bay of Fundy, and the Gulf of St. Lawrence. Wolfe having accomplished his part of the task went home on sick leave, and Amherst sailed with five battalions[286] for Boston, where he arrived on the 14th of September and was received with immense though rather inconvenient enthusiasm by the inhabitants.[287] His presence was but too sorely needed to repair the mischief wrought by Abercromby's incapacity.