As a military operation, the route by the Nile offered many advantages, and had time permitted there is no doubt that Wolseley's whole force would have gone that way. But the distance to be traversed requiring months for its accomplishment, rendered it imperative to adopt some other expedient if Gordon was to be relieved at all. Under these circumstances, it was determined to divide the expeditionary force into two columns, one to proceed across the desert to Metammeh, a distance of 185 miles, and thence to Khartoum, and the other to proceed by the river up the Nile Valley. Shortly stated, Wolseley's plans for the campaign were as follows:-- 1st. By despatching a column across the desert to Metammeh to secure the shortest passage to Khartoum, and at the same time to hold the wells at Gakdul and Abu Klea, and to occupy Metammeh whilst communications were maintained with Gordon. 2nd. By despatching a second column along the Nile Valley to disperse the rebels around Hamdab, fifty-two miles distant from Korti, to punish the Monassir tribes for the murder of Colonel Stewart, to leave Berti in safety, to rid Abu Hamid of the enemy, and to open up the desert route from thence to Korosko, whence stores and ammunition for an attack on Berber would be forwarded. Thus covering a great bend of the Nile, the column would operate on Berber, dislodge the rebels there, and join hands with the other column on the banks of the Nile at Metammeh. In a letter to the Secretary at War, Wolseley gives the reasons for adopting the above plan of operations in the following words:-- "I had always thought it possible that upon arrival here I might find it necessary to operate beyond this point in two columns--one continuing up the river in our English-built boats, while the other pushed rapidly across the desert to Metammeh, and it was with the view of securing to myself the power of moving across this desert that I proposed the formation of a Camel Brigade. "Any march across this desert with a small column, as an isolated operation, would be hazardous, and for the purpose of my mission a most useless undertaking. Such a column would most probably be able to fight its way into Khartoum; possibly it might fight its way out again; but it could never bring away General Gordon and his garrison in safety. Undertaken, however, under present circumstances, the march of a small force across this desert presents a very different aspect. The so-called Mahdi and his supporters are well aware that they have to deal not only with it, but also with the English army, which they know is advancing up the Nile on Khartoum by Abu Hamid and Berber. Upon arrival here I had to decide whether I should keep all my force together and follow the Nile Valley to Khartoum, or to divide it into two columns--one following the river, while the other was pushed rapidly across to Metammeh.