The Londonderry of the siege, standing entirely on the left bank of the Foyle, was nearly oblong in shape, extending about half a mile from north to south, and something less from east to west. It was surrounded by a strong wall without any ditch, having a small bastion at each angle. There were four gates, and in front of the southern, or Bishop's gate, a slight ravelin had been thrown up by Lundy as his sole contribution to the defence. The besieged had twenty guns, none of them as large as a twelve pounder, and many much smaller. The men bearing arms at the beginning of the siege were over 7000, divided into eight regiments, the total number of people within the walls being thirty thousand. There were about 300 cavalry under Adam Murray's command. Major Baker and George Walker were chosen joint-governors, both of them being colonels of regiments. According to the accounts hostile to Walker, he was only an assistant in charge of the stores, and no doubt that was his most important duty, but he was commonly called Governor, and always signed first, which can hardly have been without the general consent of those chiefly concerned. Many, perhaps most, of the defenders were Scots Presbyterians, or inclined that way, but sectarian differences were got over while the siege lasted. The Episcopalians had the cathedral in the morning, and the Presbyterians in the afternoon, and sermons did much to keep up the spirit of the garrison. Walker was afterwards accused of preaching in a discouraging tone, but his extant sermons do not sustain this. By the wise connivance of both Baker and Walker, Lundy was allowed to escape in disguise. On April 21 the Jacobites opened fire with one light gun from the right bank of the river, doing little damage, and on the same day the garrison made a sally towards Pennyburn Mill lower down the water, on their own side. The fighting was indecisive, but Maumont fell, perhaps by Murray's own hand. Two days later Culmore surrendered, thus giving the besiegers the means of preventing relief from the sea. On the 25th, there was another sally in the same direction, and Pusignan received a wound from which he died for want of a surgeon. On May 6 there was a sally towards Windmill Hill, on the south side of the town, to prevent an attack there, and the besiegers suffered severely, Brigadier-General Ramsay, a distinguished Scotch officer, being among the slain. The guns used by the Jacobite army were never of calibre sufficient to damage the wall seriously, and nothing like a breach was made at any time. Three mortars appear to have been used, which killed a few men and did much damage to the houses, but none to the defences. Two hundred and sixty-one shells were thrown in, each weighing 272 pounds, without the charge, and 326 of 34 pounds.[223] [Sidenote: Fight at the windmill.]