Final answer:
After Zaid's death, Jafar ibn Abi Talib assumed leadership of the Muslim army during the Battle of Mu'tah.
Step-by-step explanation:
Following Zaid ibn Harithah's death in the Battle of Mu'tah, Jafar ibn Abi Talib took command. Jafar, a cousin of Prophet Muhammad, demonstrated exceptional leadership in the face of adversity during the battle. Despite facing overwhelming odds and losing both of his arms, Jafar continued to fight valiantly until he was eventually martyred. His leadership and sacrifice in the Battle of Mu'tah are commemorated in Islamic history.
After Jafar's death, the command passed to Abdullah ibn Rawaha and later to Khalid ibn al-Walid, marking significant events during the early Islamic conquests.