Louisbourg stood on a tongue of land which lay between its harbor and the sea, and the end of which was prolonged eastward by reefs and shoals that partly barred the entrance to the port, leaving a navigable passage not half a mile wide. This passage was commanded by a powerful, battery called the “Island Battery,” being upon a small rocky island at the west side of the channel, and was also secured by another detached work called the “Grand,” or “Royal Battery,” which stood on the shore of the harbor, opposite the entrance, and more than a mile from the town. Thus a hostile squadron trying to force its way in would receive a flank fire from the one battery, and a front fire from the other. The strongest line of defence of the fortress was drawn across the base of the tongue of land from the harbor on one side to the sea on the other,--a distance of about twelve hundred yards. The ditch was eighty feet wide and from thirty to thirty-six feet deep; and the rampart, of earth faced with masonry, was about sixty feet thick. The glacis sloped down to a vast marsh, which formed 95 one of the best defences of the place. The fortress, without counting its outworks, had embrasures for one hundred and forty-eight cannon; but the number in position was much less, and is variously stated. Pomeroy says that at the end of the siege a little above ninety were found, with “a great number of swivels;” others say seventy-six.[92] In the Grand and Island batteries there were sixty heavy pieces more. Against this formidable armament the assailants had brought thirty-four cannon and mortars, of much inferior weight, to be used in bombarding the fortress, should they chance to fail of carrying it by surprise, “while the enemy were asleep.”[93] Apparently they distrusted the efficacy of their siege-train, though it was far stronger than Shirley had at first thought sufficient; for they brought with them good store of balls of forty-two pounds, to be used in French cannon of that calibre which they expected to capture, their own largest pieces being but twenty-two-pounders. According to the _Habitant de Louisbourg_, the garrison consisted of five hundred and sixty regular troops, of whom several companies were Swiss, besides some thirteen or fourteen hundred militia, inhabitants partly of the town, and partly of neighboring settlements.[94] 96 The regulars were in bad condition. About the preceding Christmas they had broken into mutiny, being discontented with their rations and exasperated with getting no extra pay for work on the fortifications. The affair was so serious that though order was restored, some of the officers lost all confidence in the soldiers; and this distrust proved most unfortunate during the siege. The governor, Chevalier Duchambon, successor of Duquesnel, who had died in the autumn, was not a man to grapple with a crisis, being deficient in decision of character, if not in capacity.