Mormon 4:10

And it came to pass that the three hundred and sixty and sixth year had passed away, and the Lamanites came again upon the Nephites to battle; and yet the Nephites repented not of the evil which they had done, but persisted in their wickedness continually.

By the year 366, the Lamanites came again to fight the Nephites. But the Nephites did not turn from the evil things they had done. They kept doing wicked things.

Year 366 came, and the Lamanites attacked again. Still the Nephites refused to turn from their evil. They just kept on with their wickedness.