At the same time, the effect was to intensify the desire to act--to redeem by success the blot which failures had brought upon his command; and the state of affairs elsewhere on the river was becoming such as to justify enterprise by the reasonable hope of substantial results. A series of circumstances which have been often narrated, and nowhere in a more interesting manner than by General Grant in his personal memoirs, had led to the abandonment of the movement by land upon Vicksburg by the Army of the Tennessee, following the Mississippi Central Railroad. Instead of this original plan of campaign, the Mississippi River was now adopted as the line of advance and of communications. The first move along this new line had been made by General Sherman, who brought with him 32,000 troops, and on the 26th of December, 1862, had landed on the low ground between the mouth of the Yazoo and Vicksburg. On the 29th the army assaulted the works on the hills before them, but were repulsed. Sherman, satisfied that the position there was too strong to be carried, had determined to change his point of attack to the extreme right of the enemy's line, higher up the Yazoo; but the heavy rains which characterized the winter of 1862-'63 in the Mississippi Valley made untenable the ground on which the troops were, and it became necessary to re-embark them. The transports were then moved out into the Mississippi, where they were joined by General McClernand, the senior general officer in the department under Grant himself. McClernand now decided to attack Arkansas Post, on the Arkansas River, which enters the Mississippi from the west about two hundred miles above Vicksburg. The Post was primarily intended to close the Arkansas and the approach to the capital of the State of the same name; but although fifty miles from the mouth of the river, it was, by the course of the stream, but fifteen by land from the Mississippi. The garrison, being five thousand strong, was thus dangerously placed to threaten the communications by the latter river, upon which the army was to depend during the approaching campaign; and it had already given evidence of the fact by the capture of a valuable transport. This post was reduced on the 11th of January, and McClernand next day started troops up the White River, a tributary of the Arkansas. From this ex-centric movement, which seemed wholly to ignore that Vicksburg and the Mississippi were the objective of the campaign, McClernand was speedily and peremptorily recalled by Grant. The latter, having absolutely no confidence in the capacity of his senior subordinate, could dispossess him of the chief command only by assuming it himself. This he accordingly did, and on the 30th of January joined the army, which was then encamped on the levees along the west bank of the river above Vicksburg.