Bible Verses About Sieges: Frequently helped by allies

And it was so on the morrow, that Saul put the people in three companies; and they came into the midst of the camp in the morning watch, and smote the Ammonites until the heat of the day: and it came to pass, that they that remained were scattered, so that not two of them were left together.

And David and his men went to Keilah, and fought with the Philistines, and brought away their cattle, and slew them with a great slaughter. So David saved the inhabitants of Keilah.