Why does the Torah insert "Kol ha'Eidah"?
Rashi: Because all of the previous generation on whom Hashem had decreed had died and the Pasuk is now referring to those about whom the Torah writes 1 "Chayim Kulchem ha'Yom"?
And what are the implications of "Hor ha'Har"?
Rashi: It was a small mountain atop a large one, like a small apple atop a large one.
How come that the Cloud that went before them did not flatten it?
Rashi: The Cloud flattened all the mountains in its path except for three