I don't think that's an accurate description at all. They are all focused on the war, mostly because I was trying to think of books without women and there's not many women on the front lines of WW1, but even in war there's huge amounts of downtime. All Quiet especially is mostly focused on this part, and I'd estimate a good third of Storm of Steel is simply Junger describing what he and his comrades did while taking cover from artillery.

The Road Back is set immediately after the war, so if course it has nothing to do with combat at all.