Now this is genuinely interesting.
When you place your knapsack on your back, your rifle on your shoulder but instead of killing that Italian soldier you spend the war polishing balls.The question is what are the soldiers in this image doing.
Here is the answer:
That is pretty interesting.It's a housing for Škoda 42 cm Haubitze M. 14/16 super heavy siege howitzer. It is basically a howitzer for soldiers who got assigned to artillery units but secretly wanted to serve on a battleship. Straight out of Jules Verne's playbook