God brought him forth out of Egypt, he hath as it were the
strength of an unicorn
Here he repeats what he had said in a former prophecy, (See Gill on Numbers 23:22): he shall eat up the nations his enemies: the seven nations of Canaan, which should be subdued by Israel, and that with as much ease as a lion devours its prey; nor would the Canaanites be able to make any more resistance to them than a creature in the paws of a lion; and the phrase denotes the utter destruction of them:
and shall break their bones;
as the lion breaks the bones of such creatures that fall a prey to him; signifying that all their strength should be taken from them, their mighty men slain, and their fortified cities taken:
and pierce [them] through with his arrows:
slay them utterly.