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Before Abu Bakr passed away, he appointed Umar as the next caliph.
After the victory of Ajnadain, Muthana came to the capital to ask for reinforcements. On the first day of his caliphate Umar appealed for volunteers and a sizeable army was raised under Abu Ubaid. Muthana succeeded in defeating Rustam the famous Persian in the battle of Namaraq.
Battle of Bridge/Jasr
Muthana and forces of Rustam meet. Abu Ubaid crossed the river, ended up being killed and got 6000 of his army killed. Continue reading