Fort Donelson is two miles north, or down the river, from Dover. The fort, as it stood in 1861, embraced about one hundred acres of land. On the east it fronted the Cumberland; to the north it faced Hickman's creek, a small stream which at that time was deep and wide because of the back-water from the river; on the south was another small stream, or rather a ravine, opening into the Cumberland. This also was filled with back-water from the river. The fort stood on high ground, some of it as much as a hundred feet above the Cumberland. Strong protection to the heavy guns in the water batteries had been obtained by cutting away places for them in the bluff. To the west there was a line of rifle pits some two miles back from the river at the farthest point. This line ran generally along the crest of high ground, but in one place crossed a ravine which opens into the river between the village and the fort. The ground inside and outside of this intrenched line was very broken and generally wooded. The trees outside of the rifle-pits had been cut down for a considerable way out, and had been felled so that their tops lay outwards from the intrenchments. The limbs had been trimmed and pointed, and thus formed an abatis in front of the greater part of the line. Outside of this intrenched line, and extending about half the entire length of it, is a ravine running north and south and opening into Hickman creek at a point north of the fort. The entire side of this ravine next to the works was one long abatis.

General Halleck commenced his efforts in all quarters to get reinforcements to forward to me immediately on my departure from Cairo. General Hunter sent men freely from Kansas, and a large division under General Nelson, from Buell's army, was also dispatched. Orders went out from the War Department to consolidate fragments of companies that were being recruited in the Western States so as to make full companies, and to consolidate companies into regiments. General Halleck did not approve or disapprove of my going to Fort Donelson. He said nothing whatever to me on the subject. He informed Buell on the 7th that I would march against Fort Donelson the next day; but on the 10th he directed me to fortify Fort Henry strongly, particularly to the land side, saying that he forwarded me intrenching tools for that purpose. I received this dispatch in front of Fort Donelson.

I was very impatient to get to Fort Donelson because I knew the importance of the place to the enemy and supposed he would reinforce it rapidly. I felt that 15,000 men on the 8th would be more effective than 50,000 a month later. I asked Flag-officer Foote, therefore, to order his gunboats still about Cairo to proceed up the Cumberland River and not to wait for those gone to Eastport and Florence; but the others got back in time and we started on the 12th. I had moved McClernand out a few miles the night before so as to leave the road as free as possible.

Just as we were about to start the first reinforcement reached me on transports. It was a brigade composed of six full regiments commanded by Colonel Thayer, of Nebraska. As the gunboats were going around to Donelson by the Tennessee, Ohio and Cumberland rivers, I directed Thayer to turn about and go under their convoy.

I started from Fort Henry with 15,000 men, including eight batteries and part of a regiment of cavalry, and, meeting with no obstruction to detain us, the advance arrived in front of the enemy by noon. That afternoon and the next day were spent in taking up ground to make the investment as complete as possible. General Smith had been directed to leave a portion of his division behind to guard forts Henry and Heiman. He left General Lew. Wallace with 2,500 men. With the remainder of his division he occupied our left, extending to Hickman creek. McClernand was on the right and covered the roads running south and south-west from Dover. His right extended to the back-water up the ravine opening into the Cumberland south of the village. The troops were not intrenched, but the nature of the ground was such that they were just as well protected from the fire of the enemy as if rifle-pits had been thrown up. Our line was generally along the crest of ridges. The artillery was protected by being sunk in the ground. The men who were not serving the guns were perfectly covered from fire on taking position a little back from the crest. The greatest suffering was from want of shelter. It was midwinter and during the siege we had rain and snow, thawing and freezing alternately. It would not do to allow camp-fires except far down the hill out of sight of the enemy, and it would not do to allow many of the troops to remain there at the same time. In the march over from Fort Henry numbers of the men had thrown away their blankets and overcoats. There was therefore much discomfort and absolute suffering.

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.

On the return of Captain Walke to Fort Henry on the 10th, I had requested him to take the vessels that had accompanied him on his expedition up the Tennessee, and get possession of the Cumberland as far up towards Donelson as possible. He started without delay, taking, however, only his own gunboat, the Carondelet, towed by the steamer Alps. Captain Walke arrived a few miles below Donelson on the 12th, a little after noon. About the time the advance of troops reached a point within gunshot of the fort on the land side, he engaged the water batteries at long range. On the 13th I informed him of my arrival the day before and of the establishment of most of our batteries, requesting him at the same time to attack again that day so that I might take advantage of any diversion. The attack was made and many shots fell within the fort, creating some consternation, as we now know. The investment on the land side was made as complete as the number of troops engaged would admit of.

During the night of the 13th Flag-officer Foote arrived with the iron-clads St. Louis, Louisville and Pittsburg and the wooden gunboats Tyler and Conestoga, convoying Thayer's brigade. On the morning of the 14th Thayer was landed. Wallace, whom I had ordered over from Fort Henry, also arrived about the same time. Up to this time he had been commanding a brigade belonging to the division of General C. F. Smith. These troops were now restored to the division they belonged to, and General Lew. Wallace was assigned to the command of a division composed of the brigade of Colonel Thayer and other reinforcements that arrived the same day. This new division was assigned to the centre, giving the two flanking divisions an opportunity to close up and form a stronger line.