The defeated Mongols build a moated fort
Editorial contextAfter the Kashmiri army routed the Tibetans near Basgo, the Mongol army fled to Tashigang, where, the chronicle says, they built a fort, surrounded it with a wall and ringed it with water, and stayed inside, secure against assault. The builders in this passage are the Mongols themselves.
the Mongol army in its flight [eventually] reached Bkra-sis-sgan. There they built a fort, shut it in with a wall, and surrounded it with water. Inside they made it secure against an assault of armies, and there they abode.
About Mongol army from Lhasa