My story so far.(the intro)I'm 14 and this will probably be my best work.?

Gun shots fire off in the distance every day, nobody knows the reason it just happens. That's why nobody expected the war. It was a day like the others, nice, warm, loud. But when that second shot went off it sent people to investigate. The authorities found a hut with many dead bodys, One for every gun shot,every day. When they were leaving to report they were ambushed by three men in black jumpsuits and wight head covers. If your wondering how I know all of this then my answer is.I. I was one of the cops,the only survivor. I reported but when I did the men multiplied. They had what looked like heavy machine guns. I looked up at an ominous sound to observe armed forces jumping out of helicopters. It seemed half were on are side and the other half was theres.