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In July 640 invading Arab army confronted the Roman Legions in Egypt in the battle of Heliopolis...
Romans deployed 25000 men approximately while Arabs had about 15000...
Despite being outnumbered Arabian horsemen outflanked the Roman army without being noticed by Roman scouts and surround them... The whole Roman army was annihilated that day leaving Egypt to be flooded by Arabs...
WI Romans had won that day? Could Egypt survived the Arabian invasion and remain in Roman hands?