Tricks of Trench Warfare (2020)
&gt; The method that actually worked was to get a few boys with rifles up on the parapet and have them shoot down into the trenches, killing everyone they could. Faster, more efficient, and no silly buggers with grenades flying back and forth.<p>The American&#x27;s brought shotguns (&quot;trench guns&quot;) to do that work.  It was seen by the Germans as violation of the law of war.<p>&quot;On 19 September 1918, the German government issued a diplomatic protest against the American use of shotguns, alleging that the shotgun was prohibited by the law of war.&quot;<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Winchester_Model_1897" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Winchester_Model_1897</a>