 However, as the trade embargo was widened eight years later, it was specifically said to be against the Russians.Russian sources mention Swedish-Yem co-operation in 1240 at the earliest; it was then that  were mentioned as one of the Swedes' allies in the little-documented Battle of the Neva.The first reliable mention of Yem being a part of Swedish forces is from 1256, seven years after the conventional dating of the so-called Second Swedish Crusade.