German trench mortar (Minenwerfer) 170 mm n/A (neuer Art) model with long barrel; the Verdun Memorial, Fleury-devant-Douaumont, France
<a href="//commons.wikimedia.org/wiki/User:Janmad" title="User:Janmad">Janmad</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>