How can I fight this Article 15?

There was a fight in my barracks and myself and two other soldier broke it up. One of the subjects in the fight the attempted to punch me and I tackled him to the ground. When I let him go he proceeded to punch me three times in the face. I did not strike him once. I am now receiving a Article 15 as a mutual combatant amongst the three because I tackled him. According to my First Sergeant the Army does not have a self defense reasoning and I am subject to the same UCMJ action as the two who were brawling in the barracks. Does anyone have advice on what to do?