This article establishes that the tümens which took part in Jebe and Sübedei's Raid to Europe were not merely conducting a reconnaissance mission, as it is usually described. The campaign was part of Chinggis Khan's conquering strategy aimed at the complete subjugation of the Kipchak and the conquest of the steppe territories not only in Asia but also in Europe. The task of implementing this strategic plan was given to Prince Jochi as the ruler of the western ulus of the Mongol Empire. Jochi was to bring his main military force to Europe while Sübedei, together with Jebe, advanced with their corps to defeat the Kipchak. The Grand Prince of Kiev and other princes of Southern Rus’, being allies and relatives of the Kipchak rulers, gave them military support. Therefore, the Mongols retaliated against the Rus’. After defeating the allied Rus’ and Kipchak forces at the Kalka River, the Mongols succeeded in crossing the Dnieper and went as far as Kiev. However, the refusal of Jochi to bring his main forces to assist the Mongol vanguard forces nullified the achievements and victories of Jebe and Sübedei. Jochi's reluctance to participate in the Western Campaign of 1221–23 was related to his conflicts with his younger brothers and Chinggis Khan himself, which, in its turn, brought about Jochi's loss of his former status in the empire, a severe illness and untimely death. As a result, Chinggis Khan had to reconsider his general conquest strategy; the conquest of Kipchak and Rus’ was postponed for one and a half decades.