After the flank march to the south side of Sevastopol the allied forces took possession of the Chersonese upland, and the Highland Brigade, leaving the Ninety-Third at Balaclava, encamped with the Guards in rear of the Light Division. Lord Raglan was solicitous regarding the port of Balaclava which had become the British base of operations, and measures had already been set on foot to protect it by a series of batteries and field-works. On the 16th of October Sir Colin was assigned by the Commander-in-Chief to the command of the troops and defences covering the port, and he promptly undertook the important and responsible duty of protecting the rear of the army. The inner defences of Balaclava consisted of a series of batteries connected by a continuous trench extending from the sea eastward of the port round the landward face of the heights to the chapel of St. Elias near the road from Balaclava to the Traktir bridge. This line of batteries and trench was held by some twelve hundred marines landed from the fleet with a weak detachment of marine artillery. About Kadikoi, on the low ground at the head of the gorge leading down to Balaclava, were several batteries, and in front of that village was the camp of the Ninety-Third Highlanders with Barker's field-battery on its flank. The exterior line of defence consisted of a chain of redoubts on the low ridge dividing the southern or inner plain from the exterior or northern valley, along which on the 25th of October the British light cavalry brigade was to make its memorable charge. Those redoubts, which were still unfinished on the day of the battle, were very weak. They were garrisoned by Turks, and their armament consisted of but nine guns in all. It was to the assault of those poor redoubts that Liprandi's field-army, some twenty-four thousand strong, advanced across the Tchernaya at daybreak of the 25th. Doubtless the Russian general had ulterior designs, comprising the discomfiture of Campbell's Highlanders and an attempt against Balaclava.