At daybreak on the 6th, the Russians made an advance in force, for the purpose of reconnoitring, from the Tchernaya into the valley or plain in rear of the heights occupied by the Allies; and, after surprising, in the grey of the morning, a picket of the Fourth Dragoons, drew off again, having accomplished their object. During the following night, a most daring reconnoissance was made, by a French officer and ten men, who, on their return to camp, reported that they had gone as far as the river Belbec, and had only seen the bivouac of the Russian troops who had made the reconnoissance the preceding day. In order to check further surprises from this quarter, parties of Zouaves and Foot Chasseurs were placed in ambuscade as outposts; every evening at six o’clock four companies of them concealing themselves in a ravine through which the Russians would advance, and remaining there until daybreak next morning. The enemy, however, forsaking the line of attack by the road from Mackenzie’s Farm, now began to appear among the mountains directly in rear of the Allied lines, and also close to Balaklava, advancing by a road from Kansara, through the hills, which was at first deemed by the Allied generals impracticable for artillery, and, consequently, along which no serious attack was anticipated. One day, however, a force of 2000 Russian cavalry, and 8000 infantry, with nine or ten guns, made its appearance in this quarter, but withdrew without showing fight. As soon as it became evident that the principal attacks of the Russian relieving army would be directed against Balaklava, means were taken to put that place in a state of defence. One of the first, was to turn out the Greek and Russian inhabitants. The little bay, so narrow at its entrance that only one ship could get out at a time, was crowded with upwards of a hundred transports, in which, besides other stores, as well as in the buildings on shore, were large magazines of gunpowder; and as it was reported that the Greek population, besides acting as spies, had actually concerted to aid the Russian attack by simultaneously setting fire to the town, Lord Raglan ordered every one of them to be ejected from the place. At the same time, a redoubt, armed with heavy guns and manned with 1200 marines from the fleet, was constructed upon the summit of a conical hill, on the further side of the bay, about 1000 feet high, and commanding the coast road approaching Balaklava from the east. Other redoubts were so placed as to command the road from the Tchernaya, and also from Kamara, through the mountains. Balaklava does not fall within the natural line of defence for besieging Sebastopol. It is held as a separate post, three miles in advance of Sebastopol heights, which form the main position of the besieging force.