IWM caption : "A British soldier fires a machine gun with periscope attachment in the trenches at Gallipoli."
Unknown author<span style="display: none;">Unknown author</span>
<a class="external free" href="https://en.wikipedia.org/wiki/Periscope_rifle#/media/File:British_machine_gun_&amp;_periscope_Gallipoli_IWM_Q_013450.jpg">https://en.wikipedia.org/wiki/Periscope_rifle#/media/File:British_machine_gun_&amp;_periscope_Gallipoli_IWM_Q_013450.jpg</a>