וְצִים֙ מִיַּ֣ד כִּתִּ֔ים וְעִנּ֥וּ אַשּׁ֖וּר וְעִנּוּ־עֵ֑בֶר וְגַם־ה֖וּא עֲדֵ֥י אֹבֵֽד׃
But ships shall come from the coast of Kittim, And they shall afflict Asshur, and shall afflict Eber, And he also shall come to destruction.
Rashi on Numbers
צים מיד כתים SHIPS FROM THE LAND OF CHITTIM and the people of Chittim — these are the Romans — will pass over in big ships against Assyria.
Rashbam on Numbers
וצים, as in Isaiah 33,21 וצי אדיר, where not even a mighty vessel can keep afloat.
Tur HaArokh
וצים מיד כתים, “and Tzim from Kittim;” a reference to the Romans.”