Benjamites join David in Ziklag
Benjamites defected from Saul and joined David when he lived in Ziklag.
Key passages
1 Ch 12:1–7

Now these are the ones who came to David at Ziklag while he was still shut up because of Saul, the son of Kish. And they were the mighty warriors helping with the war. They were armed with the bow, able to shoot right-handed or left-handed, slinging stones …