His most important contribution during the Greek War of Independence was his intelligent plan to intercept the army of Beyran Pasha at the Battle of Vasilika on August 26, 1821. Dyovouniotis, along with other chieftains of Roumeli, waited for the army in the straits of the village and literally decimated it. The victory in this battle thwarted the Ottomans' plans to strengthen the besieged Tripolitsa and destroy the Greek Revolution. At the age of 65, he was forced to resign from the command of his military corps and was awarded the honorary title of general.