The town of Bolton had been left with only some 500 men, and taking advantage of this, on February 16 the Earl of Derby and the Major-General marched from Wigan towards it with about 1,000 horse and foot and got within a mile of the place without being discovered by the garrison, which, it seems, was "at prayer in the church." And now the Earl's forces made a fatal mistake: instead of making straight for the town, they went round by Great Lever, and in doing so their presence was discovered, and the soldiers were at their posts ready to receive the besiegers. The first assault took place at Bradshaw Gate, where three forts had been erected. The contest was a severe one. The fortification consisted of certain outworks and a mud wall, 2 yards thick, on the inner side of which was an arrangement of chains, which has not been clearly defined. One account says that the invaders, with iron bullets of five or six pounds weight, shot through the mud walls; whilst another faithful narrator scornfully reports that "they played children's play, for they mortally hit but one lad," and he, common report said, was one on their own side.[138] The same authority adds that "hither their wittie malice brought a new invented mischievous instrument," which consisted of "an head about a quarter of a yard long, a staffe two yards long or more put into that head, twelve iron pikes round about and one in the end to stab with. This fierce weapon (to double their scorn) they called a _Roundhead_." The Royalists, having forced the outworks, got possession of several houses, to some of which they set fire; they were, however, ultimately driven back and retreated to Wigan, taking along with them, it is said, two or three cartloads of dead bodies.[139] When the fight was over, 1,700 men came from Middleton, Oldham, Rochdale and Manchester to the assistance of the besieged town. The officers in command of the garrison at Bolton were Colonel Ashton, Captain Buckley, of Oldham; Captain Scoffield, of Rochdale; Captain Holt, of Bury; and Captain Ashurst, of Radcliffe Bridge.