Mosiah 10:11

Now, the Lamanites knew nothing concerning the Lord, nor the strength of the Lord; therefore, they depended upon their own strength. Yet they were a strong people, as to the strength of men:

The Lamanites did not know about the Lord or his power. So they only trusted in their own strength. But they were strong men.

The Lamanites didn’t know anything about the Lord or his strength. They depended entirely on their own power. And physically, they were strong.