שַׁעֲרֵ֥י הַנְּהָר֖וֹת נִפְתָּ֑חוּ וְהַֽהֵיכָ֖ל נָמֽוֹג׃
The gates of the rivers are opened, And the palace is dissolved.
Rashi on Nahum
The gates of the river—The gates of the cities, which are on the sides of the rivers.
Rashi on Nahum
and the palace has dissolved—It has quaked and trembled because of the stones of the catapult hurled against its walls, called bombe.