War Machine Bloody Battle

We once thought... They were just fictional monsters. Until the invasion 10 years ago... The weapons that humans are proud of are vulnerable to their skin; The weapons that humans are proud of become scrap metal in front of their pets; The technology that humans are proud of is useless in the face of their invasion. But miracles never come to light. When a family is attacked by the beasts, and when a young man is killed by the beasts, a familiar sound of a chain saw reaches his ears. The big man in front of him didn't speak, he just handed the boy a rifle he was very familiar with. Several years later, the man looked at the countless soldiers and heavy weapons of the security government behind him, and the boy said the famous saying that has been passed down to future generations - gears! Counterattack!