The Battle of Brownsville was fought on August 25, 1863, near what is now Lonoke, Arkansas, between Union forces led by Colonel Washington Geiger and Confederate troops under Brigadier General John S. Marmaduke.

[3] August 10 and 11 saw 6,000 men and 16 cannons led by Union Major General Frederick Steele leave Helena to begin moving against Little Rock, the capital of Arkansas.

[4] Steele reached Clarendon, Arkansas, on August 17, where he joined forces with cavalry commanded by Brigadier General John W.

[4] Steele began moving his base of operations to DeValls Bluff while sending Davidson's men across the White River to locate the Confederates.

[8] The initial Confederate battle plan was for Walker to remain with some of the men in a woodline, while Marmaduke formed a line towards the front and tried to draw the leading Union units into an ambush.

[10] On the morning of August 25, a Union cavalry brigade led by Colonel Washington Geiger advanced and made contact with the Confederate along the edge of a prairie.

[8] A Union cavalry unit from Missouri known as Merrill's Horse attempted to cross the prairie in front of the new Confederate position, but was thrown into confusion by fire from Bell's battery.

[14] Union troops crossed the Arkansas River on September 10, and Davidson's men fought the Confederates in the Battle of Bayou Fourche while Price abandoned Little Rock.

Little Rock was the fourth Confederate state capital to fall to Union forces, and the capture of the city resulted in the Trans-Mississippi Department being even more isolated from the rest of the Confederacy.