The banner of Kornilov's Shock Detachment of the Russian Imperial Army during WWI (<a href="https://en.wikipedia.org/wiki/Kerensky_Offensive" class="extiw" title="en:Kerensky Offensive">Kerensky Offensive</a>). Then it became a part of the anti-Bolshevik <a href="https://en.wikipedia.org/wiki/Volunteer_Army" class="extiw" title="en:Volunteer Army">Volunteer Army</a> in Russia's Civil War from 1917 until 1920.
Unknown author<span style="display: none;">Unknown author</span>
before 1918 <div style="display: none;">date QS:P,+1918-00-00T00:00:00Z/7,P1326,+1918-00-00T00:00:00Z/9</div>
Henryk Mościcki.Jan Cynarski "Historia XX wieku" (History of XX c.) Warszawa 1934