One of the many outlandishly attired units in the Russian Revolution period this was the armoured train guard for Leon Trotsky dressed head to toe in red leather getting the jump on the New York Dolls for a few decades. Sotnia means 'Hundred' - it's an old Cossack designation.
Makhno, the Anarchist leader (who invented the tachanka incidentally) had a
Black Sotnia.