Casey's Infantry Tactics was the primary source of infantry drill in the Federal Army during the war. Written by Brigadier General Silas Casey, "Tactics" was the approved instruction of the infantry for the Union. All three volumes are here, including the schools of the soldier, company, skirmishers, battalion, brigade, and corps d'armée.
Casey's Tactics manual was a must read, and often reviewed by newly minted officers, eager to appear knowledgeable to their inexperienced troops. Casey's Tactics provides an important insight as to how Civil War units were drilled and led on the battlefield.
All three volumes of Casey's Tactics are listed below: