 Upon his death, Chach was succeeded by his brother Chandar; Chandar is stated to have ruled for eight years, whereupon Dahir, Chach's eldest son, inherited the throne.In 644, after the Muslim conquest of Sassanid Empire, the Rashidun army entered Makran and defeated Sindh's army in the Battle of Rasil, annexing Makran (a traditional Persian territory under control of Rai dynasty at that time) and eastern Balochistan.Caliph Umar (634-644), however, for the time being, disapproved of any incursion beyond the Indus river and ordered his subordinates to consolidate their position west of Indus.