Sayyiduna Sinan bin Wabarah al-Juhani (may Allah be pleased with him) says: We took part in the expedition of al-Muraysi' with the Messenger of Allah (peace and blessings be upon him), and our battle cry (a slogan of recognition) was: "O Mansur! Kill, kill!"
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6466