This is a question my family has been trying to answer. My great grandfather became a pacifist after the war and didn't want to talk about it, but he mentioned he was conscripted into the German army as an artilleryman. The problem is, he lived in Lucerne. Any WWI people who can answer how you might have been conscripted?

If it at all helps, he was underage until 1916 and didn't get conscripted until then.