Omni 1:28

wherefore, they went up into the wilderness. And their leader being a strong and a mighty man, and a stiffnecked man, wherefore, he caused a contention among them; and they were all slain, save fifty, in the wilderness, and they returned again to the land of Zarahemla.

So they went into the wilderness. Their leader was a strong and powerful but stubborn man. He caused fighting among them. All of them were killed except fifty, who returned to Zarahemla.

So they headed into the wilderness. Their leader was strong and powerful, but also stubborn and proud. He stirred up conflict among them. They were all killed except fifty, who made it back to Zarahemla.