John Calvin on Deuteronomy 33:22

22. And of Dan he said. He foretells that the tribe of Dan, like that of Gad, should be warlike, not so much from voluntary disposition, as from necessity; for their love of war was not to be deemed praiseworthy, inasmuch as it is altogether contrary to humanity; but because the unscrupulousness of the enemies, by which that tribe was infested, compelled them to take up arms. He compares it to a lion impetuously leaping from Mount Bashan; and the particle of comparison must be understood here, for Mount Bashan was not situated in the territory of this tribe. But Moses means to say that they should be as ready for the combat as a lion, which, after it has issued from its den into the open plains, makes an attack upon every one that it meets.