When God brought Ephraim into judgment, he would have nowhere to hide and no one to protect him (cf. Matthew 24:45-51). Then he would be the needy without defense or recourse. For the fourth time, God promised that He would judge Ephraim (cf. Isaiah 9:12; Isaiah 9:17; Isaiah 9:21). [source][source][source]
Ephraim, the Northern Kingdom, had more reason to fear God than he had to fear Assyria. Yahweh would discipline him because of his pride, corrupt leadership, selfishness, and oppression of his vulnerable citizens. He would not suffer defeat because of military inferiority but for moral inadequacy. [source][source][source]