In the assault on Gun Hill by the brigade of Guards, the two battalions of the Coldstream Guards were in reserve; the 1st battalion Scots Guards and the 3rd battalion Grenadier Guards were detailed to deliver the attack. As the latter battalions, moving in line of quarter-column, reached the wire fences along the railway line, they demolished them or scrambled through them as best they could[155] and then deployed into fighting formation. Four half companies, extended to five paces, formed the firing line of each battalion, supported at 200 paces distance by the remainder of these four companies, also extended to five paces. The battalion reserve, which followed about 200 paces behind the supports, consisted of four companies, which moved in the same formation as the leading companies but with a smaller extension between the men. As soon as the deployment was completed the advance began, and the troops moved forward through the darkness, over ground fairly open, but here and there made difficult by rocks and ant-bear holes. The only sound to be heard was the steady tramp of feet, which in the stillness of the night could be distinguished many hundred yards away by the 9th brigade. In admirable order, with their intervals and distances well maintained, the long lines of men advanced, straining their eyes to catch a glimpse of the kopjes they were to attack, and wondering when the Boers would open fire upon them. They had not long to wait. Towards 4 a.m., when the outlines of the hills began dimly to appear against the first glimmer of dawn, a violent burst of musketry rang out. Each rifle as it flashed against the dark background showed where it had been discharged. The enemy were thus seen to be dotted at irregular intervals in two tiers on the skyline and the upper slopes of the heights. [Footnote 155: In some cases it was found that the wires were too strong to be cut by the wire-cutters.] [Sidenote: Attack of Scots Guards.]