During the First World War, the Corfu island served as a island hospital and quarantine for the sick Serbian soldiers following the epic retreat of the Serbian army and part of the civilian population through Montenegro and Albania in 1915 following the Austro-German-Bulgarian invasion of Serbia (see Serbian Campaign (World War I). While the main camps of the recuperating army were on the Corfu itself (a contingent was sent to Bizerte as well, and many of the civilian refugees were accepted by France), the sick and near-dying, mostly soldiers were treated on Vido to prevent epidemics. In spite of Allied material help, the conditions of both the improvised medical facilities and many of the patients on the island resulted in high fatality rate. Due to small area of the island and it's rocky soil it soon became a necessity to bury the dead in the sea (by binding rocks to the corpses to prevent flotation). More than 5000 people were buried at sea near the island of Vido.

A monument of thanks to the Greek Nation has been erected at Vido by the grateful Serbs in 1930s.

text source: Wikipedia