 After handing over the city's plans to Governor Kapodístrias, Voulgaris joined the troops of the regular Greek army, then commanded by the governor's brother, Augustinos Kapodistrias, chief of the expedition of mainland Greece.Captain Voulgaris was responsible in particular for drawing the plan of the siege of Lepanto (Nafpaktos) and the direction of its works.In April 1829 the siege fell and the city was taken over from the Turks.