'', Painting by
Panagiotis Zographos, under the guidance of
Yannis Makriyannis: 1) Lamia; 2) Bridge and khan of Alamana; 3) Troops of Omer Vrioni and
Köse Mehmet Pasha; 4)
Athanasios Diakos captured; 5) Diakos impaled. After the death of Ali Pasha, Omer was among the commanders who were sent by
Hurşid Ahmed Pasha, the new commander-in-chief, to suppress the Greek Revolution which had broken out in March 1821. On 24 April 1821, he defeated the Greeks at the
Battle of Alamana and had their commander,
Athanasios Diakos,
impaled. Vrioni's advance was temporarily halted by
Odysseas Androutsos who, with a handful of men, inflicted heavy casualties upon him at the
Battle of the inn of Gravia on 8 May 1821.
Siege of Missolonghi In late 1822, he and
Mehmed Reshid Pasha joined forces to besiege the town of
Missolonghi. The town was completely surrounded on 25 October, and might have fallen, had the locals left the city. However they successfully resisted the siege and Vrioni resorted to negotiations in order to save his men, against the opinion of Mehmed Reshid and Yussuf Pasha. The besieged Greeks destroyed the morale of the Ottoman army and when they were reinforced by sea the novice Turkish captains and the two pashas scheduled their main assault for
Christmas night, 24 December, calculating that the Greeks would be caught by surprise. However, the attack failed. Six days later, the siege was lifted. ==Later career==