Soon after the appointment of Abu-Ubaidah as commander in chief, he sent a small detachment to the annual fair held at Abu-al-Quds, modern day Abla, near Zahlé; east of Beirut. There was a Byzantine and Christian Arab garrison guarding that fair, the size of the garrison was miscalculated by the Muslim informants and it quickly encircled the small Muslim detachment. Before it would have been completely destroyed, Abu Ubaidah, having received new intelligence, sent Khalid to rescue the Muslim army. Khalid reached there and defeated them in the Battle of Abu-al-Quds on 15 October 634 and returned with tons of looted booty from the fair and hundreds of Byzantine prisoners.