Having reunited the Blue and White Hordes into the Golden Horde, in 1382, Tokhtamysh led a successful campaign against Russia as a punishment for the Kulikovo defeat - setting back, though not ending, the Russian aspiration to free themselves of Tatar rule.
After three days of siege, Tokhtamysh was faced with a stalemate, until Donskoy's brothers-in-law opened the gates and allowed the massacre of the city's inhabitants [REF].