On January 11, 1863, Union General John McClernand and Admiral David Porter capture Arkansas Post, a Confederate stronghold on the Arkansas River. The victory secured central Arkansas for the Union and lifted Northern morale just three weeks after the disastrous Battle of Fredericksburg, Virginia.
Arkansas Post was a massive fort 25 miles from the confluence of the Arkansas and Mississippi rivers. It was designed to insure Confederate control of the White and Arkansas rivers, and to keep pressure off Vicksburg, Mississippi, the last major Rebel city on the Mississippi River. The sides of the square fort were each nearly 200 feet long and the structure was protected by a moat. It sat on a bluff 25 feet above the river. The post was a major impediment to Yankee commerce on the Arkansas.