Which battle is described in this passage from Book VIII of Publius Vergilius Maro's (Vergil's) Aeneid, and who is the queen participanting in the battle?

"Amid the main, two mighty fleets engage
Their brazen beaks, oppos'd with equal rage.
(...)
Leucate's wat'ry plain with foamy billows fries.
Young Caesar, on the stern, in armor bright,
Here leads the Romans and their gods to fight:
(...)
Rang'd on the line oppos'd, Antonius brings
Barbarian aids, and troops of Eastern kings;
Th' Arabians near, and Bactrians from afar,
Of tongues discordant, and a mingled war:
And, rich in gaudy robes, amidst the strife,
His ill fate follows him -- th' Egyptian wife.
(...)
It seems, as if the Cyclades again
Were rooted up, and justled in the main;
Or floating mountains floating mountains meet;
Such is the fierce encounter of the fleet.
(...)
The queen herself, amidst the loud alarms,
With cymbals toss'd her fainting soldiers warms --
Fool as she was! who had not yet divin'd
Her cruel fate, nor saw the snakes behind.
Her country gods, the monsters of the sky,
Great Neptune, Pallas, and Love's Queen defy:
The dog Anubis barks, but barks in vain,
Nor longer dares oppose th' ethereal train.
(...)
The trembling Indians and Egyptians yield,
And soft Sabaeans quit the wat'ry field.
The fatal mistress hoists her silken sails,
And, shrinking from the fight, invokes the gales.
(...)
Just opposite, sad Nilus opens wide
His arms and ample bosom to the tide,
And spreads his mantle o'er the winding coast,
In which he wraps his queen, and hides the flying host.
The victor to the gods his thanks express'd,
And Rome, triumphant, with his presence bless'd."

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