Abu Bakr sent Khalid ibn Walid to Syria to take command of the Rashidun army there. Khalid ibn Walid reached Syria and captured several towns, after which he reached the city of Bosra in June of 634 CE.
Abu Bakr sent Khalid ibn Walid to Syria to command the Muslim forces there. After arriving and securing several towns, he reached Bosra in June of 634 CE.