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The Battle of Arkansas Post, also known as Battle of Fort Hindman, was fought from January 9–11, 1863, near the mouth of the Arkansas River at Arkansas Post, as part of the Vicksburg Campaign of the American Civil War. Confederate forces had constructed a fort known as Fort Hindman near Arkansas Post, Arkansas in late 1862. In December of that year, a Union force under the command of Major General William T. Sherman left for an expedition against Vicksburg, Mississippi, without Major General John A. McClernand because neither Major Generals Henry Halleck nor Ulysses S. Grant trusted McClernand. After Sherman's force was repulsed at the Battle of Chickasaw Bayou, McClernand arrived and took command from Sherman in January 1863.
McClernand led an expedition to capture the Confederate force at Arkansas Post, despite disapproval from Grant. After arriving near the fort on January 9, Union infantry moved into position on January 10. A major Union naval bombardment of the Confederate fort occurred that evening. Early in the afternoon of January 11, McClernand order a major infantry assault, which moved close to the Confederate fortifications. Having suffered through severe artillery fire, white flags of surrender began to appear above the Confederate positions around 16:00 or 16:30, although the Confederate garrison commander, Brigadier General Thomas J. Churchill denied ordering the surrender. There was some confusion as the surrender occurred anyway, as one Confederate brigade commander initially refused to capitulate. Grant was eventually convinced as to the value of the movement against Arkansas Post after the fact, but demoted McClernand to corps command.
https://en.wikipedia.org/wiki/Battle_of_Arkansas_Post_(1863)