The Death of the Ancient World
If we had to pick a date for the fall of the ancient world I think September, 642 AD is as good as any. In that month the traitorous elements in the Roman Government surrendered the great fortress city of Alexandria to the Muslim invaders ending over 600 years of Roman rule.
The striking thing about the entire Arab invasion of Egypt was that Roman forces were scattered all over the country and were defeated one by one. It is what I have said for years, most "generals" are worthless bureaucrats who are vaguely aware they should point their army in the general direction of the enemy first before attacking.
The Empire Strikes Back
In September 642 Alexandria opened its gates to the Muslims even though the city had never been breeched during the so-called "siege".
Once the Muslims took over along came the tax collectors who eagerly drained the Christian Egyptians of their money. A group of leading citizens of Alexandria wrote secretly to the Emperor Constans in Constantinople, begging him to reconquer Egypt and save them from Arab oppression.
Roman tax collectors were no saints, so the Muslim tax collectors must have been especially vicious to provoke this reaction.
The Emperor began gathering a Roman fleet of 300 ships to re-take Alexandria. This operation illustrates the power of the Roman Empire even after years and years of fighting against Arab armies.
We have next to no information as to the make up of this strike force. How many infantry? how many cavalry? etc.
We can speculate. If 50 extra soldiers were loaded on to each ship times 300 ships we have an army of perhaps 15,000 men. This number is in line with a normal Eastern Roman strike force.
The Roman fleet was commanded by the admiral Manuel. Arab historians refer to him as Manuel the eunuch. Was he a palace favorite chosen for his loyalty or a professional military man? We will never know.
Landing in Alexandria
The Roman Navy had complete command of the sea. A large fleet was assembled with the greatest possible secrecy. No Arab vessels sailed the Mediterranean and so no warning of the invasion reached Egypt.
Suddenly one morning in the autumn of 645, a fleet of 300 ships was seen bearing down on the harbor of Alexandria. Roman troops were soon disembarked and the small 1,000 man Arab garrison was put to the sword.
Roman troops once again manned the walls of Alexandria, and the city acknowledged its allegiance to Caesar.
"I'm Surrounded By Idiots."
Scar (The Lion King)
Again and again and AGAIN in the early Arab campaigns we saw the power of rapidly moving Blitzkrieg style Muslim forces. The Arabs were anxious to fight in open country. They skillfully drew their enemies out of their fortifications and then defeated them in the open desert.
So what did the idiot Roman commander do?
Rather than secure the walled fortress of Alexandria against attack, he sent his troops far away from the safety of the city to fan out across the lower Nile delta.
An Opportunity lost. A powerful fortress-city of Alexandria could be endlessly supplied by the Roman Navy. That would have prevented Arabs from advancing up the coast to Libya and Carthage. From that secure fortress the Romans could build outwards to re-take and fortify Egyptian towns one-by-one.
Instead, the Muslim commander Amr ibn al Aasi arrived at the city of Babylon and "delayed" there in order to draw the Romans even deeper into Egypt.
The Battle of Nikiou / Alexandria