Verses 16 through 23 describe the conquest of the Philistines under Saul.
According to verse 16 the multitude of the Philistine army was melting away, and they were going here and there.
Saul found out that his son Jonathan and his helper had gone away from him to attack the Philistines (v. 17).
In verses 18 and 19 Saul did something quite goodhe sought God's leading through the priest and the ark.
Saul heard that the tumult that was in the camp of the Philistines continued to increase. He and all the people who were with him gathered together and went into the battle, while each Philistine's sword was against his companion, and the tumult was very great (v. 20).
The Hebrews who had previously been with the Philistines and who had gone up with them into the camp also turned to be with the Israelites who were with Saul and Jonathan (v. 21).
Even all the men of Israel who had hidden themselves in the hill country followed Saul and Jonathan closely in the battle (v. 22).
That day Jehovah saved Israel from the Philistines (v. 23).