Conversation so far:
What did Frederick Russell Burnham do in WWI?
During World War I, Burnham was selected as an officer and recruited volunteers for a U.S. Army division similar to the Rough Riders, which Theodore Roosevelt intended to lead into France.
how did Frederick Russell Burnham raise the division?
A plan to raise volunteer soldiers from the Western U.S. and Burnham was put in charge of both the general organization and recruitment.

Question: what did they do?
Self-contained rewrite: what did the infantry division do?