Oil slicks on bridges
 

Just a quick suggestion, let oil carts put slicks on bridges, i wanna set more of the world on fire.....

Haha - I actually had the same problem with my defense strategy, I`ll keep this in mind for the future patches. This would be really useful defending towns some towns.

Before adding that can you make elven rain spell autocast. I dont want to see my woods on fire. Evil men and orcs :p