Go down to Egypt. Isaiah continues (see ch. 30:2-7) rebuke of the leaders of Judah for turning to Egypt for help against Assyria. Judah was so weak in cavalry that the Assyrians tauntingly offered to provide 2,000 horses if Hezekiah could set riders upon them (ch. 36:8). The Hebrew politicians sought to make up for this weakness by an appeal to Egypt.
Stay on horses. That is, “depend on horses.” In ancient times horses were used almost exclusively for warfare. God, who had once given Israel a signal triumph over the horses and chariots of Pharaoh (Ex. 14:9, 17, 18, 23, 27; 15:19), was forgotten, and Egypt, now a relatively weak nation (see Vol. II, p. 53), was looked to as a source of help.