1 Samuel 13:17

13:17 Raiding bands went out from the camp of the Philistines in three groups. One band turned toward the road leading to Ophrah by the land of Shual;

1 Samuel 11:11

11:11 The next day Saul placed the people in three groups. They went to the Ammonite camp during the morning watch and struck them ¹  down until the hottest part of the day. The survivors scattered; no two of them remained together.

¹ tn Heb “Ammon.” By metonymy the name “Ammon” is used collectively for the soldiers in the Ammonite army.