Athens’ Forgotten Army in Egypt
In a bid to outmaneuver Sparta, Athens sent thousands to fight in distant Egypt—only to lose nearly all trace of them.

Unknown — "Portrait of a Youth with a Surgical Cut in one Eye" (A.D. 190–210), public domain
A gamble in the Nile Delta.
In 459 BCE, Athens sent 200 ships and thousands of men to support an Egyptian revolt against Persian rule. The plan: open a second front, outflank the Persians, and show Athenian power. At first, it worked—the Athenians occupied Memphis and won small victories.
Disaster in slow motion.
Then Persian reinforcements arrived. The Athenians were besieged in the marshes of Prosopitis for 18 brutal months. When the Persians diverted the Nile, the trapped Greeks tried to escape—almost all were killed or captured. Thucydides says only a handful made it home. Athens didn’t even admit the scale of the loss for years.
An entire Athenian expedition vanished in the Nile Delta, abandoned by allies and leadership—a disaster eclipsed by later defeats but stunning in its scale and silence.