 So it is agreed 'Amr should lead the prayer despite he still newly converted Muslim while Abu Ubaidah is veteran companion of Prophet who had adhered Islamic teaching for long time

after the Muslim army has reached the outskirt of the enemy encampments, 'Amr sending scouts.Soon 'Amr realized their enemy forces dwarved his forces by astronomical margin.Many accounts from surviving soldiers of Muslims stated that the enemy exceeding a hundred thousands.