The Battle of Valtetsi, on May 12, 1821 was one of the first battles in the Greek War of Independence against the Ottoman Empire

In a social media post, Greece's Defense Minister Nikos Dendias wrote: “At dawn on Palm Sunday, the Free Besieged chose the ultimate sacrifice.”

Roughly one-third of the archive’s contents are being made public for the first time, offering historians, researchers, students, and the wider public fresh insight into pivotal chapters of modern Greek history.

The victory at Kleisova was more than military—it was a moral revival for the starving defenders, proving that courage could defy overwhelming odds.