I am possibly being charged with Aggravated ault. Opinions Please.?

On Feb. 28 2009 I was camping with some friends at the Little Sahara Sand Dunes in Utah. At around 9 or 10 oclock my friend, my little brother and I were riding around on a four-wheeler riding wheelies(Grizzly 450). We were going by the other camps doing it and they were loving it and cheering us on. We were riding by and making sure we weren't going to hit anything or anyone. The last camp we rode through got very upset and so we left and weren't going to come back. Once we got outside the camp we started to wheelie again, the four-wheeler stalled. While the four-wheeler was stalled the people caught up to us, one ahead of the rest. He started screaming at us(F*** You, What the F***, You guys want your f***ing a**es kicked!). At first we started to apologize, but the guy kept saying we were getting our a**es kicked and started pushing us and trying to push my friend off the four-wheeler. At this point I stepped off the machine so I could be standing if anything happened, at the same moment I started hearing voices screaming "F*** those mother f***ers, let's f*** them up!". There were around 15+ of them and four of us, of which two were my little brother and my buddies nephew. I turned around and hit the first kid hard, knocking him unconscious. Then was tackled by someone, my buddy jumped on him and started hitting him. I stood up and was being pushed by two people one of which swung and hit me behind my left ear, I then hit him knocking him loopy cause he was stumbling for a second before dropping to the ground. Mind also that this place has a very bad reputation for a mob beating the hell out of 4-5 people sending them to the hospital with serious injuries(has happened to 4 of my friends already). Apparently one of the kids has a broken jaw(I'm guessing the one I hit first, it was a very hard punch.), and while taking him to the hospital they got pulled over for speeding then explaining why. Causing the police to get involved, I just don't understand how these allegations can be made when the other party started the ault and out numbered us greatly. Thank you for your time.