On August 10, 1864, Dockery received his commission as a brigadier-general and raised an Arkansas brigade, which he led in the Red River Campaign and participated in the Battle of Mount Elba, Battle of Prairie D'Ane, Battle of Poison Spring Battle of Marks' Mill and the Battle of Jenkins' Ferry. During this campaign, Dockery commanded a brigade in Fagan's cavalry division. The brigade consisted of the 18th Arkansas, 19th Arkansas, and 20th Arkansas Mounted Infantry Regiments, and the 12th Arkansas Infantry Battalion (mounted).