during the 1755 manchu campaign against the dzungar khanate, chingünjav and amursana conspired to start a rebellion in autumn of the same year. however, their seniors came to know of their plans and separated them. chingünjav was sent to fight in uriankhai, and amursana was summoned to beijing for demanding too big a share of the dzungar khanate. on the way, his escort let him escape. this led to the trial and execution of the commander of the escort, a brother of the jebtsundamba khutugtu and direct descendant of chingis khan, in early 1756, an event that gravely disturbed the khalkha nobility.