Wars, horrendous wars,
and the Tiber foaming with tides of blood, I see it all!

          [Bella, horrida bella,
Et Thybrim multo spumantem sanguine cerno.]

Virgil the Poet
Virgil (70-19 BC) Roman poet [b. Publius Vergilius Maro; also Vergil]
The Aeneid [Ænē̆is], Book 6, l. 86ff (6.86-87) [The Sybil] (29-19 BC) [tr. Fagles (2006)]
    (Source)

(Source (Latin)). Alternate translations:

Wars, horrid wars I see,
And Tyber swell'd with blood.
[tr. Ogilby (1649)]

Wars, horrid wars, I view -- a field of blood,
And Tiber rolling with a purple flood.
[tr. Dryden (1697)]

Wars, horrid wars, I foresee, and Tiber foaming with a deluge of blood.
[tr. Davidson/Buckley (1854)]

War, dreadful war, and Tiber flood
I see incarnadined with blood.
[tr. Conington (1866)]

          Dreadful war,
And Tiber frothed with blood, I see from far.
[tr. Cranch (1872), ll. 111-12]

Wars, grim wars I discern, and Tiber afoam with streams of blood.
[tr. Mackail (1885)]

          Lo, war, war, dreadful war!
And Tiber bearing plenteous blood upon his foaming back.
[tr. Morris (1900)]

          Woes in store,
Wars, savage wars, I see, and Tiber foam with gore.
[tr. Taylor (1907), st. 13, ll. 116-17]

          War, red war!
And Tiber stained with bloody foam I see.
[tr. Williams (1910)]

Wars, grim wars I see, and Tiber foaming with streams of blood.
[tr. Fairclough (1916)]

          War, I see,
Terrible war, and the river Tiber foaming
With streams of blood.
[tr. Humphries (1951)]

          Wars, dreadful wars
I see, and Tiber foaming with torrents of human blood.
[tr. Day-Lewis (1952)]

I see wars, horrid wars, the Tiber foaming
with much blood.
[tr. Mandelbaum (1971), ll. 122-23]

          Wars, vicious wars
I see ahead, and Tiber foaming blood.
[tr. Fitzgerald (1981), ll. 132-33]

I see wars, deadly wars, I see the Thybris foaming with torrents of blood.
[tr. West (1990)]

          War, fierce war,
I see: and the Tiber foaming with much blood.
[tr. Kline (2002)]

War, I see horrible war, and the Tiber
Foaming with blood.
[tr. Lombardo (2005)]

I see brutal wars and bloody torrents frothing in the Tiber.
[tr. Bartsch (2021)]