Bible Verses About Sieges: Frequently helped by allies

The next day Sha'ul divided the people into three companies. Then they entered the camp of the 'Amoni during the morning watch and kept attacking until the heat of the day, until those who remained were so scattered that no two of them were left together.

David and his men went to Ke'ilah and fought the P'lishtim. They defeated them in a great slaughter and led away their livestock. Thus David saved the inhabitants of Ke'ilah.