[Sidenote: Rain and fog a hindrance.] Unfortunately, at this juncture, very unfavorable weather set in and continued with scarcely a break during the remainder of October and the early part of November. Poor visibility seriously interfered with the work of our artillery, and constant rain turned the mass of hastily dug trenches for which we were fighting into channels of deep mud. The country roads, broken by countless shell craters, that cross the deep stretch of ground we had lately won, rapidly became almost impassable, making the supply of food, stores, and ammunition a serious problem. These conditions multiplied the difficulties of attack to such an extent that it was found impossible to exploit the situation with the rapidity necessary to enable us to reap the full benefits of the advantages we had gained. [Sidenote: Enemy has time to reorganize.] None the less, my right flank continued to assist the operations of our allies against Saillisel, and attacks were made to this end, whenever a slight improvement in the weather made the co-operation of artillery and infantry at all possible. The delay in our advance, however, though unavoidable, had given the enemy time to reorganize and rally his troops. His resistance again became stubborn and he seized every favorable opportunity for counterattacks. Trenches changed hands with great frequency, the conditions of ground making it difficult to renew exhausted supplies of bombs and ammunition, or to consolidate the ground won, and so rendering it an easier matter to take a battered trench than to hold it. [Sidenote: French take Sailly-Saillisel.] On September 12 and 18, 1916, further gains were made to the east of the Les Boeufs-Gueudecourt line and east of Le Sars, and some hundreds of prisoners were taken. On these dates, despite all the difficulties of ground, the French first reached and then captured the villages of Sailly-Saillisel, but the moment for decisive action was rapidly passing away, while the weather showed no signs of improvement. By this time, too, the ground had already become so bad that nothing less than a prolonged period of drying weather, which at that season of the year was most unlikely to occur, would suit our purpose. [Sidenote: New line established.]