Following the defeat and death of Cyrus the Younger at the Battle of Cunaxa near Babylon, a mercenary army of ten thousand Greek soldiers found themselves stranded deep within the hostile Achaemenid Empire. Led eventually by the Athenian soldier and philosopher Xenophon, the army embarked on a grueling two-year trek northward across the rugged mountains of Anatolia and Armenia. Enduring bitter winter snows, starvation, and constant guerrilla attacks from local tribes, they finally reached the Greek colony of Trapezus on the Black Sea, shouting the famous cry 'Thalatta! Thalatta!' ('The sea! The sea!'). This monumental feat demonstrated the vulnerability of the Persian Empire and became a legendary testament to disciplined military endurance.

Xenophon recorded this epic journey in his foundational autobiographical narrative, the 'Anabasis', which profoundly shaped classical Greek prose literature and military history. Centuries later, the dramatic march and the emotional cry of 'The sea!' inspired numerous Romantic and Victorian poets, including John Keats and Elizabeth Barrett Browning, who used the imagery of the exhausted soldiers reaching the ocean as a metaphor for spiritual awakening, poetic liberation, and triumph over long-suffering adversity.