Words of Mormon 1:14

And in the strength of the Lord they did contend against their enemies, until they had slain many thousands of the Lamanites. And it came to pass that they did contend against the Lamanites, until they had driven them out of all the lands of their inheritance.

With the Lord’s strength, they fought their enemies until they had killed many thousands of Lamanites. They kept fighting the Lamanites until they had pushed them out of all their lands.

In the Lord’s strength, they fought their enemies until they’d killed many thousands of Lamanites. They kept fighting until they’d driven them completely out of their territory.