How do I switch of the battle timer?

[The_Emperor]

How do I switch it on?

An enemy army assaulted my settlement. I killed all their infantry and destroyed most of their siege equipment. They had only cavalry left (ie no chance of getting inside the city). I thought victory was mine but nooo.... the enemy cavalry stayed out of range and I hadn't enough troops to attack them outside the walls (and I shouldn't have to!)...

I think that if you have the timer off and you are inside the walls and the enemy is outside and has no way inside you can easily quit the battle and it will be a draw... You might want to test this though.