In October 1854 the French attempted to capture the summit of the hillock with a coup de main but were repulsed with casualties of about 600 officers and men. During the winter of 1854/55 the Russians built the Kamtschatka Redoubt on the summit of the Mamelon as part of a comprehensive defensive ring of double and in some parts triple lines of continuous defensive works around Sevastopol. During the campaign season of 1855, after two more failed attempts, and following a heavy bombardment and the capture of the outlying defences, the Kamtschatka Redoubt was stormed and captured by the French in early June. During the final assault, the British took some of the outlying works and suffered casualties of 30 officers and 350 other ranks; the French in the main assault deployed many more men and suffered about three times the British casualties.
^The British also called the hillock and the fortifications on it Mamelon Vert, but it is not clear if the French also used that name for the same hillock or if they called a different hillock Mamelon Vert (Dodd 1856, p. 393).