How will we reconcile this Pasuk with Pasuk 25, which stated that the Cana'ani and the Amaleki lived in the valley?
Chizkuni #1: Most of the Cana'anim and Amaleikim lived in the valley, but some lived in the mountain. 1
Chizkuni #2: They really lived in the valley; but when they heard that Yisrael were on the verge of attacking them, they ascended the mountain to ambush them. 2
Chizkuni: This is borne out by the words "ha'Yoshev ba'Har ha'hu", in Pasuk 45, implying that some of them lived elsewhere.
The question - on both Pesukim - remains however, that when the spies returned, they informed the people that Amalek dwells in the south and the Cana'ani by the sea (in the west). See 13:29.
Why does the Pasuk use the double Lashon "Vakum Vayaksum"
Rashi: To teach us that they smote them again and again. 1
What is the significance of "Chormah", which has not been mentioned until now?