Resupply cities under siege

[Erik Springelkamp]

It proves to be pretty easy to resupply cities under siege.

Supply trains under evasive orders will generally succeed in entering and leaving cities under siege.

Even putting a cavalry unit in attack mode next to the siege force doesn't prevent this in general.

I wonder if this is really by design, because it hard enough to siege without siege engines, and when one can resupply the city, non-roman forces have virtually no chance of capturing cities.