By 3.30 the highest hill of the range was reached by the cavalry scouts, and the broad intervening valley of Tamaai could be seen from its summit through the haze. About four o'clock the infantry squares reached the base of the hill and halted for a few minutes, whilst the scouts were pushed forwards. At five o'clock they came in and reported that the enemy, estimated at 4,000 men, were advancing to the attack. The force was at once formed up in a defensive position on a favourable piece of ground, having a clear space of 100 yards to the front, and, as there was now barely an hour of daylight left, the Engineers and pioneers were set to work to form a zeriba round the camp by cutting down the mimosa bushes which grew plentifully about. Before this the enemy had fired a few rifle shots and had shown in some numbers on a ridge about 1,200 yards distant. By way of checking this, and to show the power of the guns, two of the 9-pounders and a Gardner gun fired a few rounds, and the enemy disappeared. The operations of the day thus closed, the cavalry were sent back to Baker's zeriba to water their horses, and, tired with their day's exertion, the infantry lay down within the irregularly-shaped square formed by the mimosa bushes. The men lay two deep and slept with their great-coats on and their arms beside them. Orders were given that all lights should be extinguished at nine. About a quarter to one on the morning of the 13th there was an alarm, and the enemy opened a distant dropping fire, which continued throughout the night, causing few casualties, but disturbing the men's rest. One man of the York and Lancaster was killed, and five, including an officer, were wounded, as well as some camel drivers and horses. At sunrise a 9-pounder and the Gardner gun were run out and made some excellent practice at a range of 1,300 yards, dispersing the enemy, who retired to their main position near the wells of Tamaai. About 7 a.m. Stewart arrived with his cavalry, and at 7.30 ordered out the Mounted Infantry to feel the enemy. At 8 o'clock the whole force moved out from their bivouac. A native who accompanied the troops, and who had lately been a prisoner in Osman Digna's camp, informed General Graham that the bulk of the enemy's force would be in a deep khor, or watercourse, the sides of which would serve as an intrenchment. Graham therefore directed the advance to be made to the left of this position, where the ground rose a little, intending (as he stated in his despatch) to sweep the ravine with artillery fire before attacking.