Why did Moshe compare their defeat at the hands of the 'Emori' to an attack of bees?
Rashi: Because, like bees (which die after they have stung), the moment an 'Emori' struck a Yisrael, he died. 1
Hadar Zekenim #1, Riva: When one bee leaves, all the others go out. So Amalek came out and Kena'an with him
Here it says that the Emori struck and chased Yisrael until Charmah, In Bamidbar (21:3), it says that Yisrael defeated the Kena'anim, and called the place Charmah!
Hadar Zekenim: There were two wars in Charmah.
Here it says that the Emori struck the Mapilim. In Bamidbar (14:45), it says that ha'Amaleki veha'Kena'ani struck them!
Ibn Ezra: Ha'Emori is the Kena'ani, like I explained (Bamidbar 14:25).
The Amaleki and the Kena'ani came to help the Emori (refer to 1:44:1:2).
Malbim: The Amaleki and the Kena'ani were in the valley and the mountain. The latter were called Emori, for Emori ruled that area. They struck Yisrael, and the Amaleki and the Kena'ani in the valley did not need to, for they saw that Yisrael were defeated.