<P> The vassal emperor of the Tanguts (Western Xia) had earlier refused to take part in the Mongol war against the Khwarezmid Empire . Western Xia and the defeated Jin dynasty formed a coalition to resist the Mongols, counting on the campaign against the Khwarazmians to preclude the Mongols from responding effectively . </P> <P> In 1226, immediately after returning from the west, Genghis Khan began a retaliatory attack on the Tanguts . His armies quickly took Heisui, Ganzhou, and Suzhou (not the Suzhou in Jiangsu province), and in the autumn he took Xiliang - fu . One of the Tangut generals challenged the Mongols to a battle near Helan Mountains but was defeated . In November, Genghis laid siege to the Tangut city Lingzhou and crossed the Yellow River, defeating the Tangut relief army . According to legend, it was here that Genghis Khan reportedly saw a line of five stars arranged in the sky and interpreted it as an omen of his victory . </P> <P> In 1227, Genghis Khan's army attacked and destroyed the Tangut capital of Ning Hia and continued to advance, seizing Lintiao - fu, Xining province, Xindu - fu, and Deshun province in quick succession in the spring . At Deshun, the Tangut general Ma Jianlong put up a fierce resistance for several days and personally led charges against the invaders outside the city gate . Ma Jianlong later died from wounds received from arrows in battle . Genghis Khan, after conquering Deshun, went to Liupanshan (Qingshui County, Gansu Province) to escape the severe summer . The new Tangut emperor quickly surrendered to the Mongols, and the rest of the Tanguts officially surrendered soon after . Not happy with their betrayal and resistance, Genghis Khan ordered the entire imperial family to be executed, effectively ending the Tangut lineage . </P> <P> The succession of Genghis Khan was already a significant topic during the later years of his reign, as he reached old age . The long running paternity discussion about Genghis's oldest son Jochi was particularly contentious because of the seniority of Jochi among the brothers . According to traditional historical accounts, the issue over Jochi's paternity was voiced most strongly by Chagatai . In The Secret History of the Mongols, just before the invasion of the Khwarezmid Empire by Genghis Khan, Chagatai declared before his father and brothers that he would never accept Jochi as Genghis Khan's successor . In response to this tension, and possibly for other reasons, Ögedei was appointed as successor . </P>

Who was the founder of nomadic empire when was he born what was his childhood name