Joshua chapter 10 says this.

Adonai Zedek, the king of Jerusalem, heard that Joshua had captured and completely destroyed Ai and killed its king, just as he had destroyed the town of Jericho and killed its king.

He also learned that the Gibeonites had made peace with Israel and were now their allies.

He and his people had become very afraid when they heard all this because Gibeon was a large town, as large as the royal cities and larger than Ai.

And the Gibeonite men were strong warriors.

So King Adonai Zedek of Jerusalem sent messages to several other kings, Haram of Hebron, Piram of Jamath, Japhia of Lachish, and Deborah of Eglon.