From Sahih Bukhari (Hadith 4271):
Narrated Salama (in another narration):I fought seven Ghazwat (i.e. battles) along with the Prophet (ﷺ) and also fought in nine battles, fought by armies sent by the Prophet (ﷺ) . Once Abu Bakr was our commander and another time, Usama was (our commander)
Reference: Bukhari 4271