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.
what did the infantry division do?
Roosevelt's World War I volunteers was a proposed military volunteer formation of Americans to fight in France for the Allies.
what else did frederick do in WWI besides recruit volunteers?
During World War I, Burnham was living in California and was active in counterespionage for Britain.

Question: why was this?
Self-contained rewrite: why did Frederick Russell Burnham do counterespionage instead of recruit volunteers?