Ancient Armies vs Modern Weapons

You are a modern soldier who has travelled back in time, and history wants you dead. Ten ancient armies march on you: Macedonians on the island, Vikings on the frozen shore, Samurai below the mountains, Roman legions in the forest, Aztecs in the jungle, Spanish conquerors at the castle and more. Warriors on foot and lancers on horseback keep coming until the last one falls. You carry a machine gun, a flamethrower and grenades. Keep moving, switch weapons and run back to the ammo crate to reload.