From Sahih Bukhari (Hadith 4273):
Narrated Yazid bin Abi Ubaid:Salama bin Al-Akwa` said, "I fought in seven Ghazwat along with the Prophet." He then mentioned Khaibar, Al-Hudaibiya, the day (i.e. battle) of Hunain and the day of Al-Qarad. I forgot the names of the other Ghazwat
Reference: Bukhari 4273