10 During Saul’s reign they waged war against the Hagrites, who were defeated at their hands; they occupied the dwellings of the Hagrites throughout the entire region east of Gilead.

Read 1 Chronicles 5:10 Using Other Translations

And in the days of Saul they made war with the Hagarites, who fell by their hand: and they dwelt in their tents throughout all the east land of Gilead.
And in the days of Saul they waged war against the Hagrites, who fell into their hand. And they lived in their tents throughout all the region east of Gilead.
During the reign of Saul, the Reubenites defeated the Hagrites in battle. Then they moved into the Hagrite settlements all along the eastern edge of Gilead.