By blade and bayonet

One day you wake up in trenches. Next second you hear artillery barrage and explosion. Get up and fight ! Do you want to live forever? MC get's isekaied into world resembling WWI times but with some major differences. Luckily he has system as a gift. So he will not become ordinary G.I. P.S non-native English language writer trying to write action based on BF1 and other shooters.