Battles at fortresses

[licker]

Not storming forts, but breaking siege, or using your forces on patrol when the enemy first attacks the province.

Assuming the defender routs, where do the retreaters go?

Can they retreat into the fort or do they scatter to adjacent owned provinces?

Further if you rout while being stormed I assume everything dies, even if there are adjacent provinces.

From the manual it looks like I only found the 'break siege routs result in elimination' bit.