Rashi on Numbers 24:24/רש"י על במדבר כ״ד:כ״ד

1צים 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.

2וענו עבר AND WILL AFFLICT THEM ON THE OTHER SIDE (עבר) of the river Euphrates.

3וגם הוא עדי אבד BUT HE ALSO SHALL PERISH EVERLASTINGLY — (“He” means the Romans). And so, too, did Daniel expressly state, (Daniel 7:11) “until the beast (Rome) was slain and its body destroyed".

4וצים means [AND] BIG SHIPS, as it is written (Isaiah 33:21) “A gallant ship (צי)", the Targum translation of which is “a big ship” (Yoma 77b).