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When he retreated across the Libyan desert with the remnant of Pompey’s army after the battle of Pharsalia. Lucan, Pharsalia , Book IX :⁠—

“Foremost, behold, I lead you to the toil,

My feet shall foremost print the dusty soil.”

“Foremost, behold, I lead you to the toil, My feet shall foremost print the dusty soil.”

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