Crimea, where the Republic of Genoa had trading stations. The Mongols captured and plundered the Genoese city of Soldaia. Meanwhile, Koten fled to the court of his son-in-law, Prince Mstislav the Bold of Halych. He warned Mstislav: "Today the Mongols have taken our land and tomorrow they will take yours". However, the Cumans were ignored for almost a year as the Rus had suffered from Cuman raids for decades. But when news reached Kiev that the Mongols were marching along the Dniester River, the Rus responded. Mstislav gathered an alliance of the Kievan Rus' princes including Mstislav III of Kiev and Prince Yuri II of Vladimir-Suzdal, who promised support. The Rus princes then began mustering their armies and going towards the rendezvous point. Battle Initial moves The number of men present at the battle is disputed. A major factor in this is the fact that no primary sources give the number of men present at the battle, which leaves modern historians to estimate the number of men. Historian Leo de Hartog gives the size of the Rus' army as 30,000, while Richard Gabriel and Hector Hugh Munro claim that the size of the Rus' army was 80,000. De Hartog also estimates the size of the Mongol army as 20,000, while Gabriel estimates that it was around 23,000 men. However, historian John Fennell, an expert on Kievan Rus and early Russian history, and one well-versed in the primary sources, calls many of these figures into doubt, saying the numbers given in the Russian sources (there are no Mongol or Polovtsian sources, at least none that have survived, and other sources from other cultures, if they exist, are rather dubious) are formulaic or exaggerated and the chronicles contradict themselves. The information given in the Novgorod First Chronicle and the Primary Chronicle would imply a total of 11,000 soldiers for the Rus' forces, but Fennel considers even these numbers to be exaggerations. While Russian historians in the Soviet era have traditionally given estimates of around 80,000-100,000, modern Russian historians have taken a revisionist stance with a consensus settling on drastically lower numbers, with the Mongols having a numerical advantage. Russian historian D.G. Khrustalev estimated in 2013 that the Rus' army consisted of 10,000 soldiers (including mercenaries), while the Cumans brought 5,000 cavalry, for a total of 15,000. Carl Sverdrup estimates the army at 8,000, and says 30,000 and 80,000 are enormous exaggerations. The