Conversation so far:
What happened in Edward Canby's early military career?
During Edward Canby's early career, he served in the Second Seminole War in Florida.
What was Edward Canby's rank in the military?
Edward Canby received three brevet promotions, including to major for Contreras and Churubusco, and lieutenant colonel for Belén Gates.

Question: What did Canby do in the Mexican-American war?
Self-contained rewrite: What did Edward Canby do in the Mexican-American war?