The Expedition of Usama bin Zayd also known as the Army of Usama ibn Zaid to al-Balqa, took place in 11AH of the Islamic calendar, in May 632. Usama ibn Zayd was appointed as the commander of an expeditionary force which was to invade Palestine again (and attack Moab and Darum), on the orders of Muhammad. He set out with 3000 men on the same day Muhammad died, when he reached the destination he attacked the inhabitants, killing many, taking as many captives as he could.