Exploring my mind

First I would like to mention: In this dream I did not see any blood besides in the last scenes. It did not feel like killing people, they rather got unconscious.
I was in a war. I don't know what happened before, but a classmate and I were the only people alive from our team. Suddendly a huge army appeared. First we only saw a small part of them and started firing. I used a special type of ammunition which schould change peoples minds, but instead I noticed them turning into rocks. Then we looked further and I realised this being a army of many man. (At this moment I didn't see people turned into rocks anymore.) Strangely they offered us to refill and reload our weapons and then to fight against them. At the fight not everyone started to shoot at us, meanwhile my classmate was shot - he wasn't dead but he was bleeding. They took him away immediately, nobody was shooting anymore. Then they took me somewhere, too.