It was now November. The Nile was falling fast, and an impassable rapid began to appear at Um Tiur, four miles north of the confluence. The Sirdar had a few days in which to make up his mind whether he would keep his gunboats on the upper or lower reach. As in the latter case their patrolling limits would have been restricted, and they would no longer have been able to watch the army at Metemma, he determined to leave them on the enemy's side of the obstruction. This involved the formation of a depot at Dakhila ['Atbara Fort'], where simple repairs could be executed and wood and other necessities stored. To guard this little dockyard half the 3rd Egyptian battalion was moved from Berber and posted in a small entrenchment. The other half-battalion followed in a few weeks. The post at the confluence was gradually growing into the great camp of a few months later. A regular system of gunboat patrolling was established on the upper reach, and on the 1st of November the Zafir, Naser, and Metemma, under Commander Keppel, again steamed south to reconnoitre Mahmud's position. The next day they were joined by the Fateh, and on the 3rd the three larger boats ran the gauntlet of the forts. A brisk artillery duel ensued, but the Dervish aim was, as usual, erratic, and the vessels received no injury. It was observed that the position of the Dervish force was unchanged, but that three new forts had been constructed to the south of the town. The gunboats continued on their way and proceeded as far as Wad Habeshi. The Arab cavalry kept pace with them along the bank, ready to prevent any landing. Having seen all there was to be seen, the flotilla returned and again passed the batteries at Metemma. But this time they were not unscathed, and a shell struck the Fateh, slightly wounding three men. No other incident enlivened the monotony of November. The Khalifa continued his defensive preparations. Mahmud remained motionless at Metemma; and although he repeatedly begged to be allowed to advance against the force near Berber he was steadily refused, and had to content himself with sending raiding parties along the left bank of the Nile, and collecting large stores of grain from all the villages within his reach. Meanwhile the railway was stretching further and further to the south, and the great strain which the sudden occupation of Berber had thrown upon the transport was to some extent relieved. The tranquillity which had followed the advance to Berber was as opportune as it was unexpected. The Sirdar, delighted that no evil consequences had followed his daring move, and finding that he was neither attacked nor harassed in any way, journeyed to Kassala to arrange the details of its retrocession.