Jamieson, Fausset and Brown on 1 Chronicles 12:8-13

8-13. of the Gadites there separated themselves unto David--that is, from the service of Saul and from the rest of the Gadites who remained steadfast adherents of his cause.

into the hold--or fortress, that is, of Ziklag, which was in the wilderness of Judah.

whose faces were like the faces of lions, &c.--A fierce, lion-like countenance (2Sa 1:23), and great agility in pursuit (2Sa 2:18), were qualities of the highest estimation in ancient warfare.