Grant's arrival followed a broader institutional need to coordinate the western armies under a Division of the Mississippi. The U.S. Army disliked promoting officers above major general, while the Navy was similarly reluctant to recognize ranks above captain. Without field-marshal-style grades, the Union used a geographic command to place several armies under one officer. Rank culture and organization shaped the command solution before any battlefield plan was written.
Notable Point · 36:01-36:47
Grant's theater command worked around a shallow U.S. rank structure
Coordinating several Union armies required a geographic command because the American services still resisted ranks above major general and captain.