General Henry Halleck — a military scholar who commanded the Union forces in the Western Theater during 1861-62 — had which one of the following nicknames?

General Henry Halleck — a military scholar who commanded the Union forces in the Western Theater during 1861-62 — had which one of the following nicknames?

Crafty Halleck
Clever Henry
Old Brains
Whip-Smart Hank
The Astute Coot

Correct Answer: Old Brains