乞伏乾帰
In 391, Qifu Gangui's general Yuezhi Jiegui (越質詰歸) rebelled, but after Qifu Gangui personally led an army against him, Yuezhi surrendered—and Qifu Gangui married the daughter of a clansman to Yuezhi, showing Qifu Gangui's tendency to try to personally connect with tribal chiefs to get them to submit to him. However, later 391, the strategy could have said to have backfired as the tribal chief Mo Yigan (沒奕干) initially submitted and sent two sons as hostages to him, seeking his aid in a campaign against another tribal chief, Da Dou (大兜). Qifu Gangui aided him and defeated Da in battle, and then sent Mo's sons back to him, to try to get Mo to be more grateful of him. However, Mo instead turned against Qifu Gangui and aligned himself with the Xiongnu chief Liu Weichen (劉衛辰), and Qifu Gangui, in anger, attacked Mo and, in battle, fired an arrow that struck Mo's eye. During the campaign against Mo, however, Lü Guang the prince of Later Liang took this opportunity to attack Western Qin, forcing Qifu Gangui to withdraw to face him. This incident appeared to start several years of intermittent battles between Western Qin and Later Liang.