It can be really difficult sometimes to get this kind of thing figured out. You should check any insurance documents that you have. If you can't find the information there, you should talk to your insurance agent. With that help you should be able to figure out if this damage is covered. If it's not you're probably going to need to find a good company to help you put a new fence in place of the old one, or just to repair it if that's all it needs.