The enemy's swords have ceased forever. The enemies have ceased, but their swords remain forever, like Constantine who built Constantinople, Philip who built Philia, Antiochus who built Antioch, Alexander who built Alexandria, and Siculus who built Sicily. They have ceased, but their swords remain. And you, you have uprooted cities. (See Isaiah 54:9) Zion and Jerusalem, your holy cities, have become a desert.
They are forgotten, but God will always remain. Another interpretation is that the enemy's swords have ceased, like Caesar and Rome, and cities have been uprooted (Malachi 1:4) "Because you will say Edom is destroyed". Philip asked Rabbi Eliezer, "But doesn't the prophet say, 'Because you will say Edom is destroyed, they will rebuild and I will destroy?'" But all the buildings they built remain.
The Rabbi replied, "The scripture is not speaking about the buildings, but about the counsel. Whatever you sit and plan in your hearts to do to us, it is what destroys your own counsel." He replied, "Your words are true, for every year we sit and plan to destroy you, but one sage comes and nullifies our plan."