Before Mongol invasion of Rus' in the 13th century, a Prince would be accompanied by his Druzhina, a small retinue of heavy cavalry, who would often fight dismounted (eq. Battle on the Ice). Massively heavy armor was used, mostly Scandinavian-style. However, these squads, as a rule, did not exceed the number of several hundred men, and were unsuitable for united actions under a single command.