Conversation so far:
What was Abner Doubleday's role in Gettysburg?
At the start of the Battle of Gettysburg, Abner Doubleday's division was the second infantry division on the field to reinforce the cavalry division of Brigadier General Buford.
What side did Abner Doubleday fight on during the American Civil War?
Abner Doubleday (June 26, 1819 – January 26, 1893) was a career United States Army officer and Union major general in the American Civil War.

Question: Who were some of his comrades?
Self-contained rewrite: Who were some of Abner Doubleday's comrades?