Significance of Nineveh's fall

We are studying Nahum in an Explore the Bible lesson entitled “Affirm God’s Justice”. As an analogy to how Judah rejoiced at the fall of Nineveh, the LifeWay Adult Commentary mentions how the fall of the Berlin Wall and collapse of the East German government brought joy to all of Germany.

The Jews had a covenant relation with Yahweh, who had used the Assyrians to judge Israel, the northern kingdom, and campaign against Judah in 701 BC. Nahum prophesied that the LORD would zealously keep His covenant with Judah and judge the Assyrians—Nineveh fell in 612 BC (remind members of the vicious nature of the Assyrians by reading about their destruction of Judean city of Lachish).