Of the Gadites there separated themselves to David to the stronghold in the wilderness, mighty men of valor, men trained for war, that could handle shield and spear; whose faces were like the faces of lions, and they were as swift as the roes on the mountains;
"To the stronghold in the wilderness"  (1 Chronicles 12:8).  This was prior to David's days at Ziklag.  The particular stronghold is not mentioned, but it might have been either Engedi or Adullam.