1000's of male doctors, but no female nurses (or I need glasses ) !.
Barbarians at the gates.
In 370 AD the Roman Emperor Valens allowed several hundred thousand barbarian 'refugees' to enter and settle within Europe.
The Army were furious, they wanted to wipe them out, at first, as was their job, when Barbarians attempted to cross the river they fired at them and cut down any survivors. But then, due to politicians wanting cheap labour, they were told to let them cross.
And in under a hundred years the descendants of those same 'refugees' were in control of Western Europe.