Adam Clarke on Isaiah 19:17

And the land of Judah - The threatening hand of God will be held out and shaken over Egypt, from the side of Judea; through which the Assyrians will march to invade it. It signifies that kind of terror that drives one to his wit's end, that causes him to reel like a drunken man, to be giddy through astonishment. Such is the import of חג chag, and חגה chagah. Five MSS. and two editions have לחגה lechagah.