On the 18th the 19th Hussars, the Mounted Infantry, and the Gordon Highlanders made a march to the wells of Handouk, a few miles from Souakim. They found them all deserted, and no signs of the enemy. A zeriba was formed at the base of a detached hill held by a company of the Highlanders. News was brought to the camp that Osman Digna's force was increasing, and that he had announced his intention of renewing the fighting. He was reported to have 2,000 men with him. On the 19th General Stewart, with two squadrons of Hussars, went to Otao, eight miles further west, in search of the enemy, but in vain. A squadron was also sent to Tamanieb, where Osman was reported to be, but found no traces of him. On the 21st two batteries of artillery and also the 10th Hussars were moved out to Handouk. On the 23rd the Gordon Highlanders were sent to a point near the entrance of the Tamanieb valley to form a new zeriba in conjunction with a company of the 89th, which marched from Souakim to join them, with water and stores. On the 25th General Graham marched with two brigades, under Buller and Davis respectively, to a zeriba eleven miles from Souakim. The march-out was a most exhausting one on account of the heat, and between 300 and 400 men fell out of the ranks. There were numerous cases of sunstroke. According to one account, the number of men who fell out was equal to one-fourth of the whole force, the rear of which, it is said, resembled a routed army. Many of the sick found room in the ambulances, and others trudged along as best they could on foot. The men were now becoming tired and disgusted with the campaign, and there was a good deal of grumbling and dissatisfaction in the ranks. The whole force bivouacked when nine miles from Souakim, and the night's rest restored the men who had fallen out during the march, and all but four returned to duty on the morning of the 26th.