Bible Verses About Sieges: Frequently helped by allies

And it cometh to pass, on the morrow, that Saul putteth the people in three detachments, and they come into the midst of the camp in the morning-watch, and smite Ammon till the heat of the day; and it cometh to pass that those left are scattered, and there have not been left of them two together.

And David goeth, and his men, to Keilah, and fighteth with the Philistines, and leadeth away their cattle, and smiteth among them--a great smiting, and David saveth the inhabitants of Keilah.