Many chiefs of the Alans and Circassians surrendered to Möngke. After the invasion of Eastern Europe, Möngke would bring them back to Mongolia. He also participated in the Siege of Kiev (1240). Möngke was apparently taken by the splendour of Kiev and offered the city surrender, but his envoys were killed. After Batu's army joined Möngke's soldiers, they sacked the city. He also fought alongside Batu at the Battle of Mohi. In the summer of 1241, before the premature end of the campaign, Möngke returned home after his uncle Ögedei recalled him in the winter of 1240–41. However, Ögedei died. In 1246, Temüge, Genghis Khan's sole remaining brother, unsuccessfully tried to seize the throne without confirmation by a kurultai. The new Khagan Güyük entrusted the delicate task of trying the Odchigin ("keeper of the hearth" – a title given to both of Genghiz's younger brothers) to Möngke and Orda Khan, the eldest brother of Batu. Güyük eventually died en route to the west in 1248 and Batu and Möngke emerged as main contenders. Toluid revolution Following his mother Sorghaghtani's advice, Möngke went to the Golden Horde to meet Batu, who was afflicted with gout. Batu decided to support his election and called a kurultai at Ala Qamaq. The leader of the families of Genghis Khan's brothers, and several important generals, came to the kurultai. Güyük's sons Naqu and Khoja attended briefly but then left. Despite vehement objections from Bala, Oghul Qaimish's scribe, the kurultai approved Möngke. Given its limited attendance and location, this kurultai was of questionable validity. Batu sent Möngke under the protection of his brothers, Berke and Tuqa-temur, and his son Sartaq to assemble a formal kurultai at Kodoe Aral in Mongolia. When Sorghaghtani and Berke organized a second kurultai on 1 July 1251, the assembled throng proclaimed Möngke the Great Khan of the Mongol Empire, and a few of the Ögedeid and Chagatayid princes, such as his cousin Kadan and the deposed khan Qara Hülegü, acknowledged the decision. Shortly thereafter, Oghul's son Khoja and Ögedei's favorite grandson came to "pay homage" to Möngke as the new ruler, but they brought the entire army of the Ögedei faction with them. Möngke's Kankali falconer, Kheshig, discovered the preparations for the attack and told his lord. At the end of the investigation under his father's loyal servant Menggesar noyan, he found his relatives guilty but at first wanted to give