Do I have an assault case?

I went to a neighbor's home to discuss a drainage issue. Was invited in. Went to back of house to look. I explained the issue and asked if there was anything we could do. His reply: "No, I'm not digging up my yard." I calmly said there has been a natural culvert there since the neighborhood was built. He said he looked into it and legally doesn't have to do anything. I said, So you do whatever you want, doesn't matter how it affects your neighbors? He said he has a paper from the homeowner's association. I said, So you got permission? Just like you got permission to cut all of your trees down? He said he didn't need permission to cut the trees. I said he did, it was in our covenants. At that point he got loud, "Get out." I said, "Wait a minute. You invited me in. I'd like to resolve this." He screamed, "Get out!" I said, "You're an ass," turned around, and next thing I know I'm flying through the air. He had decked me from behind, down his eight front steps onto his walk and yard.