What is the significance of the name "Adoni Tzedek"?
Above (9:2), it says that all the kings of Kena'ani gathered together. Why did only five come to fight the Giv'onim?
Malbim: Hashem thwarted their plans. He made discord among them. The Giv'onim are the Chivi, who gathered with the others to fight Yisrael (9:1). These five kings were irate and came to fight the Giv'onim. They fell to Yehoshua, for they were separated from the gathering of all the kings.