The monument on the square reminds of the Macedonian Struggle of 1904-1908, aimed at liberating Macedonia from the collapsing Ottoman Empire and uniting it with Greece; several Polykastrins fought against Bulgarian detachments of the Internal Macedonian Revolutionary Organization (IMRO) and Turkish Armies. Finally Polykastro and the area was captured by the Greek Army during the First Balkan War in 1912. Most of its Bulgarian population was expelled to Bulgaria. The area became again an war theatre during WWI (Macedonian front). en.wikipedia.org/wiki/Polykastro#Macedonian_Struggle