Plaque of Nickolas Kolmaniatis on Hydra. Credit: Spilios SpiliotisThe island of Hydra honored the Greek heroes of the Independence War of Argentina, Nickolas Kolmaniatis and Samuel Spiro, in a special event on Friday.The event was organized by Hydra Mayor Georgios Koukoudakis in memory of the two national heroes of Argentina from Hydra. After the laying…