Answer: Overconfidence
Step-by-step explanation:
Before the attack on Adobe Walls, Quanah Parker and the other Indian attacker took part in a sun dance where a Comanche medicine man proclaimed that he had a vision where the Natives would win. He also said that bullets would not work on them.
This gave the Natives such confidence that they attacked the hunters so brazenly leading to many losses on their part. The Comanche eventually retreated on the sixth day after Quanah was injured.