Borisov District's first partisan unit was formed in October 1941. It was led by Ivan Yarosh, while Fyodor Yudanov was enlisted there as a liaison and intelligence officer. He gathered information about the passing German troops, their weapons and numbers, enemy trains and other vehicles. In March 1942, the unit revealed traitors among its ranks. This was later recorded in the Voroshilovets literary and art journal, Issue No. 1, Voroshilov partisan unit, Shchors Brigade.