During one battle, this state's army formed a tight wall of spearmen around firing archers for four days to thwart the attack plans of Vahan the Armenian, whom they defeated on the sixth day.
During one battle, this state's army formed a tight wall of spearmen around firing archers for four days to thwart the attack plans of Vahan the Armenian, whom they defeated on the sixth day. Ten rules of military conduct issued by this state's first leader include a ban on burning trees and harming enemy livestock. One general of this state eliminated the Rai dynasty by capturing Kerman and Makran at the same time that this state besieged Sistan, and the armies of this state often used elite warriors who would seek out enemy champions and duel them, known as mubarizun. One such man, who won the Battle of Buzakha during the Ridda Wars, was Khalid ibn Walid. This state defeated Emperor Heraclius's troops at Yarmouk, and absorbed the Sassanids, but its last leader was killed at Karbala by troops under Yazid I. For 10 points, name this state ruled by Umar and Uthman between Abu Bakr and Ali, named for a set of immediate successors to Muhammad often called "rightly-guided".
During one battle, this state's army formed a tight wall of spearmen around firing archers for four days to thwart the attack plans of Vahan the Armenian, whom they defeated on the sixth day.
Rashidun caliphate [accept Rightly Guided Caliphs/ate until the last two words are read]