Trivial Trivia - taking trivia to new levels

[RJNorton]

Hint #2: He was shot during the Civil War and was declared unfit for service at the front.

Hint #3: He was assigned to the War Department and saw Lincoln almost daily.

Hint #4: Quite by accident he was out walking on April 14 and saw Abraham and Mary's carriage go by as they headed to the Navy Yard during their last ride together.