Isaiah 51:23

Instead, God would give Israel’s enemies His cup of wrath to drink. They had walked all over Israel, but that would end. The figure of walking on the backs of enemies stresses the victor’s desire to humiliate the captives, not to slay them (cf. Joshua 10:24).

To summarize God’s plans for Israel as revealed in Isaiah, unless she repented she would experience His judgment. God would use surrounding nations to punish His people. After this punishment, God would restore Israel and punish her oppressors (cf. Habakkuk 1-2).