The opposite considerations were, however, tremendous. Abu Hamed marked a definite stage in the advance. As long as Merawi and the other posts in Dongola were strongly held, the line from Abu Hamed to Debba was capable of easy defence. Abu Hamed could soon be made impregnable to Dervish attack. The forces in Dongola could be quickly concentrated on any threatened point. At this moment in the campaign it was possible to stop and wait with perfect safety. In the meantime the Khalifa would steadily weaken and the railway might steadily grow. When the line reached the angle of the river, it would be time to continue the systematic and cautious advance. Until then prudence and reason counselled delay. To occupy Berber was to risk much. Mahmud, with a large and victorious army, lay at Metemma. Osman Digna, with 2,000 men, held Adarama almost within striking distance. The railway still lagged in the desert. The Dongola garrisons must be weakened to provide a force for Berber. The Dervishes had the advantage of occupying the interior of the angle which the Nile forms at Abu Hamed. The troops in Berber would have to draw their supplies by a long and slender line of camel communication, winding along all the way from Merawi, and exposed, as a glance at the map will show, throughout its whole length to attack. More than all this: to advance to Berber must inevitably force the development of the whole war. The force in the town would certainly have its communications threatened, would probably have to fight for its very existence. The occupation of Berber would involve sooner or later a general action; not a fight like Firket, Hafir, or Abu Hamed, with the advantage of numbers on the side of the Egyptian troops, but an even battle. For such a struggle British troops were necessary. At this time it seemed most unlikely that they would be granted. But if Berber was occupied, the war, until the arrival of British troops, would cease to be so largely a matter of calculation, and must pass almost entirely into the sphere of chance. The whole situation was premature and unforeseen. The Sirdar had already won success. To halt was to halt in safety; to go on was to go on at hazard. Most of the officers who had served long in the Egyptian army understood the question. They waited the decision in suspense.