the byzantine commanders knew that the next target of the muslims would be alexandria. they accordingly prepared for the expected siege of the city. their strategy was to keep the muslims away from alexandria by destroying their power through continued sallies and attacks from the fort. even if this did not keep them away, it would weaken them morally and physically. it would be more of a war of patience than strength. in february 641, 'amr set off for alexandria from babylon with his army. all along the road from babylon to alexandria, the byzantines had left regiments to delay, and if possible, inflict losses on the advancing muslims.