"The Imperial Russian Army (Russian: Ру́сская импера́торская а́рмия, tr. Rússkaya imperátorskaya ármiya) was the land armed force of the Russian Empire, active from around 1721 to ...
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the Russian Revolution of 1917. In the early 1850s, the Russian Army consisted of more than 900,000 regular soldiers and nearly 250,000 irregulars (mostly Cossacks)." - (en.wikipedia.org 04.09.2021)