Summary: I besiege any town in the game or castle and when they run out of food, the garrisons die off from attrition, but not the militias. So just then I besieged a town with 700 troops, 200 garrison and 500 militia for 15 days, the garrison all died but they still had 500 militia left which took no losses.
How to Reproduce: Besiege anything until it starves
How to Reproduce: Besiege anything until it starves