During the 12th and 13th, and until the arrival of Wallace and Thayer on the 14th, the National forces, composed of but 15,000 men, without intrenchments, confronted an intrenched army of 21,000, without conflict further than what was brought on by ourselves. Only one gunboat had arrived. There was a little skirmishing each day, brought on by the movement of our troops in securing commanding positions; but there was no actual fighting during this time except once, on the 13th, in front of McClernand’s command. That general had undertaken to capture a battery of the enemy which was annoying his men. Without orders or authority he sent three regiments to make the assault. The battery was in the main line of the enemy, which was defended by his whole army present. Of course the assault was a failure, and of course the loss on our side was great for the number of men engaged. In this assault Colonel William Morrison fell badly wounded. Up to this time the surgeons with the army had no difficulty in finding room in the houses near our line for all the sick and wounded; but now hospitals were overcrowded. Owing, however, to the energy and skill of the surgeons the suffering was not so great as it might have been. The hospital arrangements at Fort Donelson were as complete as it was possible to make them, considering the inclemency of the weather and the lack of tents, in a sparsely settled country where the houses were generally of but one or two rooms.