Killed by the Artillery.
Your ignorance is, as already stated on this thread, "breath-taking".
My late Grandfather served in the trenches as a "Doughboy" in the 42nd Infantry Division. For some reason, I was the only one he confided in regarding his experiences in the war. From his accounts, my late Dad's accounts of WWII and my extensive studies about Europe, may we never bail out the French again!
The thing is that you probably do not have to.