Re: Did you ever defend a city succesfully from an enemy army that outnumbered you just with the garrison troops?
I've defended cities successfully with only garrison troops against a full stack. However, I don't play on the hardest difficulty levels and this only worked when I had a large garrison force. I don't think I could usually manage this against multiple enemy armies, without adding a general and recruiting some mercenaries to reinforce the garrison.
I sometimes find it easier to defend unwalled (rather than walled) cities. In my Suebi campaign I've got some large garrisons and their garrison cavalry are useful.
My advice would be the obvious things:
Hold choke points with good defensive infantry, if you can. If possible, hold the enemy in a street and send light infantry, skirmishers (or whatever you have) to attack the enemy in the rear.
Your skirmishers are much more effective if they can shoot at the enemy's unshielded right flank or rear, ideally from close range. If the enemy have no cavalry, consider sending skirmishers to force the enemy to divert some of their troops to chasing them.
In unwalled cities, use garrison cavalry to kill their skirmishers after their melee infantry are engaged. In walled cities, keep your cavalry inside the walls unless the enemy have no cavalry.
Last edited by Alwyn; July 17, 2020 at 11:51 AM.