Military Intelligence History: Civil War

William B. Feis offers us the first scholarly examination of the use of military intelligence under Ulysses S. Grant's command during the Civil War. Feis makes the new and provocative argument that Grant's use of the Army of the Potomac's Bureau of Military Information played a significant role in Lee's defeat. Feis's work articulately rebuts accusations by Grant's detractors that his battlefield successes involved little more than the bludgeoning of an undermanned and outgunned opponent.

Most histories of the Civil War explain victory and defeat in terms of the skill of commanders and their troops. Intelligence records disappeared after the war, and thus a critically important element has largely been ignored. Fishel has unearthed substantial collections of such records, and his "intelligence explanation" radically alters history's understanding of the campaigns. The Secret War for the Union is one of the most important Civil War works ever published.