After this Lao Tzŭ rallied many of the skilful spirits to help Chiang Tzŭ-ya in his battle with Wên Chung, providing them with the Ancient Immortal of the South Pole’s Sand-blaster and an earth-conquering light which enabled them to travel a thousand li in a day. From the hot sand used the contest became known as the Red Sand Battle. Jan Têng, on P’êng-lai Mountain, in consultation with Tzŭ-ya, also arranged the plan of battle.