As he went to Ziklag, these men of Manasseh deserted to him: Adnah, Jozabad, Jediael, Michael, Jozabad, Elihu, and Zillethai, chiefs of thousands in Manasseh.
We have here an account of those that appeared and acted as David's friends, upon the death of Saul, to bring about the revolution. All the forces he had, while he was persecuted, was but 600 men, who served for his guards; but, when the time had come that he must begin to act offensively, Providence brought in more to his assistance.
Commenting on 1 Chronicles 12:1-22
And these are the numbers of the bands that were ready armed to the war,.... That were trained up to it, and accounted for it: and came to David to Hebron; after the death of Ishbosheth and Abner, and when David had reigned seven years in Hebron: to turn the kingdom of Saul to him; to transfer it to him and his family: according to...
As he went to Ziklag--If those Manassites joined him on his return to Ziklag, after his dismissal from the Philistine army, then their arrival took place before the battle of Gilboa could have been fought (compare Sa1 29:11). Convinced of the desperate state of Saul's affairs, they abandoned him, and resolved to transfer their allegiance to David.