Well I don't have much choice but to attack at this point.
I only have 450 inf + 80 arc + 160 cav while I need to beat back 530 inf + 160 arc + 200 cav.
I think I will have some peasants on my side, about 5-600? I think it will be a suicidal attack but if I don't I will lose a vital region.
And they're behind walls? Unless your troops are much better quality, that's a suicide attack for sure.