attack of dead men

Intro (couldn't fit attack of the dead men) It's 1915, the early years of the great war (ww1) you and around 7000 other german soldiers are launching an attack on osowiec fortress. you have been told that theres only 100 russian soldiers defending it none of them have proper gas masks. to make it quick and easy you send out the gas toward the enemy line. but something isnt right you still can hear movementfrom the enemy line and a faint rumble of footstep getting louder. (yes this really happened look it up)