Conversation so far:
What did George S. Boutwell do in the early civil war years?
Boutwell attended the Peace Conference of 1861 in Washington, D.C. which attempted to prevent the impending Civil War
What was George S. Boutwell's role in preventing the impending Civil War?
In the peace conference, he angrily rejected Southern proposals favoring the extension of slavery and its enforcement in northern states
what was George S. Boutwell reason for rejection of Southern proposals?
arguing that the Union is not worth preserving if such measures are needed to do so
Was there anything else that George S. Boutwell did in the early years besides attempting to prevent the impending Civil War?
In June and July 1862, Boutwell served on a military commission in the Department of War

Question: what was his job at the Department of war?
Self-contained rewrite: what was George S. Boutwell job at the Department of war?