I believe "let the die be cast" is more likely since Caesar declared war and the outcome is unknown. "The die is cast" implies the act is irreversible which is also true.

"And so, when he was come to the river Rubicon, he stood in silence and delayed to cross, reasoning with himself, upon the magnitude of his adventure. Then, like one who casts himself from a precipice into a yawning abyss, and calling out in Greek these words only ...

"Let the die be cast," he set his army across."- Plutarch Life of Pompey 60.2



http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Lives/Pompey*.html …

You can follow @lil_herodotus.

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