The advance in force from Dongola commenced on the 2nd December, from which date the troops as they arrived were moved on beyond Debbeh to Ambukol, where a depôt for supplies had been formed and placed in charge of Stewart. The head-quarters were established at the latter place on the 12th December. From Ambukol the force was moved a few miles further up the river to Korti, a much healthier spot. Sir Herbert Stewart, with the Mounted Infantry and Guards' Camel Corps, reached Korti on the 15th December, after a march along the east bank of the Nile. Wolseley's arrival at Korti on the 16th was followed by that of the South Staffordshire Regiment. The last companies of the South Staffordshire, with part of the Sussex Regiment, reached the front on the 22nd, and they were speedily followed by other detachments. The Light Camel Corps, under Colonel M'Calmont, arrived on the 24th, after a twenty days' march from Wady Halfa, and at the same time the Heavy Camel Corps came up from Debbeh. General Buller, the Chief of the Staff, reached the front soon afterwards. Of the Nile journey Wolseley reported to Lord Hartington, "The English boats have up to this point fulfilled all my expectations. The men are in excellent health, fit for any trial of strength, as the result of constant manual labour." As a commentary on the above, it may be mentioned that nine out of sixteen boats which brought up some of the Duke of Cornwall's Regiment were lost, and the remainder, owing to the slightness of their build, had to be patched with tin to prevent their sinking--over fifty boats in all were lost. There can be no doubt as to the "constant manual labour" mentioned by Lord Wolseley. The men arrived in a deplorable plight, many of them without either boots or trousers. A more ragged set of soldiers never arrived at the seat of war. According to one account there was literally not a sound garment in the whole column, and the men resembled Falstaff's ragged regiment rather than a body of British troops. By Christmas Day, a great part of the expeditionary force was concentrated at Korti.[108] It now became necessary to decide upon the route to be adopted by the expeditionary force in order to reach Khartoum. The one important question to consider was that of time; already the journey up the river had taken much longer than was expected. The season during which military operations could be carried on was limited, and if, as had been intended, the expedition was to return before the hot weather there was not a day to spare. Moreover, Gordon's latest communications showed that he was rapidly running short of provisions, and if not speedily relieved Khartoum must fall.