Helaman 11:26

and thus in time, yea, even in the space of not many years, they became an exceeding great band of robbers; and they did search out all the secret plans of Gadianton; and thus they became robbers of Gadianton.

In just a few years, they became a huge gang of robbers. They learned all of Gadianton’s secret plans. So they became Gadianton robbers.

Before long—in just a few years—they became a massive gang of robbers. They dug up all of Gadianton’s secret plans and became the new Gadianton robbers.