Prussian helmet of First World War, in the Royal Military Museum, Brussels. The legend says "Mit Gott für König und Vaterland"; translation: "With God for King and Fatherland".
<a href="//commons.wikimedia.org/wiki/User:Hispalois" title="User:Hispalois">Hispalois</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>