In the early summer of 1905, the groups of the Castorian Philolaus Picheaon (Captain Filotas) and the Cretan Ioannis Kalogerakis joined the decimated forces of the Cretan George Dikonymos-Makris, who was operating between the villages of Belkameni (now Drosopigi, Florina), Strebeno (now Asprogeia, Florina), Prekopana (now Perikopi, Florina), Lehovo, Negovanis (now Flamburo, Florina), and so on. After a meeting, the chiefs decided to attack Prekopana, where the armed groups of chieftains Mitre the Vlach (Mitros Vlachos), Kole and others were hiding.

On June 20, the armed groups of Makris and Filotas attacked Prekopana by surprise, leaving Ioannis Kalogerakis and his men to guard Belkameni. Mitre the Vlach, probably sensing the movements of Makris and Filotas, managed to escape from the village of Prekopana and counterattacked the Greek troops from the south. The battle lasted for hours and was ended by the intervention of the Ottoman army.

The next day (June 21, 1905), Ioannis Kalogerakis tried to ambush the Bulgarian Exarchist group that was supposedly passing through Aetozi. However, due to his treachery, the movements of the chieftain became known to the Ottomans of Sorovits (now Amyntaio, Florina), who sent a detachment to confront Kalogerakis. During the conflict, Ioannis Kalogerakis and three other men: H. Bilelakis, P. Papamanousakis, and St. Androulakis, were killed, while the rest escaped and joined the groups of Captain Makris and Captain Filotas. The two chiefs avenged the death of the four Macedonian fighters by capturing 18 Bulgarian Komitadji from the villages of Voulgaroblatsi (now Oxya, Kastoria) and Viseni (now Vyssiniya, Kastoria) and executing 9 of them.