Around 91 ASC, Yeh-Lu and the Rough Rhinos destroyed Jet's village, costing the boy his parents. In the spring of 100 ASC, Aang, Katara, and Sokka were rudely awoken by the arrival of the Rough Rhinos, who were attempting to capture the Avatar. The team managed to escape, but Sokka's boomerang was left behind and subsequently claimed as a spoil of war by Yeh-Lu.
The explosives specialist and the rest of the Rough Rhinos attacked Chin Village soon thereafter and claimed it in the name of Fire LordOzai. Aang and the Water Tribe siblings helped defend of the village. During the fight, Sokka distracted Vachir by reflecting sunlight in his magnifying glass. The archer blindly shot a burning arrow in Sokka's direction. The arrow missed the Water Tribe warrior, and embedded itself, instead, in the saddle bag attached to Yeh-Lu's rhino. Sokka ducked for cover as the bag, containing five sticks of dynamite, caught fire. Yeh-Lu immediately saw the danger and tried to save himself by throwing the bag on the roof of a neighboring house. However, the house collapsed under the thunderous explosion; the force of the explosion slammed Yeh-Lu and his mount against a wall. As Sokka looked up again, Yeh-Lu's helmet rolled by and a bag containing Sokka's boomerang landed next to him.
Later that spring, the Rough Rhinos, hunting fugitives, ran into Iroh and Zuko, who were traveling through the Earth Kingdom as refugees. When the two fled on their ostrich horse after quickly disposing of four of the five Rough Rhinos, Yeh-Lu was the only one still capable to ride in pursuit. In an attempt to halt the Fire Nation fugitives, he threw a grenade in the path of the fleeing ostrich horse. The grenade exploded ahead of the animal, but Iroh and Zuko pushed through and emerged through the dust of the explosion. They rode away to safety as Yeh-Lu ceased his pursuit.