Musannaf Ibn Abi Shayba 36:116

Zayd ibn al-Hubab narrated to us, he said: Husayn ibn Waqid narrated to me, he said: Matar al-Warraq narrated to me, from Qatadah: That the Messenger of Allah (peace and blessings of Allah be upon him) went on nineteen military expeditions (ghazawat), and he fought in eight: the Day of Badr, the Day of Uhud, the Day of the Confederates (al-Ahzab), the Day of Qudayd, the Day of Khaybar, the Day of the Conquest of Mecca, the Day of the water of Banu al-Mustaliq, and the Day of Hunayn.