Don Carlos Buell
Fought in the second Seminole war.
His attack style was more slow, planned, and deliberate than most other generals of the Union army of the time. This caused him to be replaced by a more aggressive commander.
In 1861 he marched volunteers to Tennessee, because he was commissioned as brigader of volunteers.
When he was wounded he was put on staff duty.
In 1862 he marched to The Battle of Shiloh with reinforcements for Ulysses S. Grant.