Helaman 5:17

And it came to pass that they did preach with great power, insomuch that they did confound many of those dissenters which had gone over from the Nephites, insomuch that they came forth and did confess their sins, and were baptized unto repentance, and immediately returned to the Nephites, to endeavor to repair unto them the wrongs which they had done.

They preached with great power. They proved wrong many people who had left the Nephites. These people came and admitted their sins. They were baptized to show they stopped sinning. Right away they went back to the Nephites. They tried to fix the wrongs they had done.

They preached with such power that they completely overwhelmed many of the Nephite deserters. These people confessed their sins, were baptized as a sign of repentance, and immediately returned to the Nephites, trying to make up for the wrongs they’d done.