And the Hebrews who had previously gone up into the surrounding camps to join the Philistines now went over to the Israelites who were with Saul and Jonathan.
We have here the prosecution and improvement of the wonderful advantages which Jonathan and his armour-bearer gained against the Philistines. I. The Philistines were, by the power of God, set against one another. They melted away like snow before the sun, and went on beating down one another (Sa1 14:16), for (Sa1 14:20) every man's sword was against his fellow.
Commenting on 1 Samuel 14:16-23
Moreover, the Hebrews that were with the Philistines before that time,.... Who either were their servants and bondsmen they brought along with them, or such in whose cities they dwelt, or had taken as they came along, and forced into their army; or it may be some of them were renegades from the Israelites, deserters, who for safety and subsistence betook themselves to them as the stronger party.
Moreover the Hebrews [that] were with the Philistines before that time, which went up with them into the camp [from the country] round about, even they also [turned] to be with the Israelites that [were] with Saul and Jonathan. (k) Though before for fear of the Philistines they declared themselves as enemies to their brethren.