The uprising began in March, and established itself with the capture of the provincial capital, Salona (modern Amfissa), on 27 March 1821. The Ottoman garrison held out in the citadel until April 10, when the Greeks took it. At the same time, the Greeks suffered a defeat at the Battle of Alamana against the army of Omer Vryonis, which resulted in the death of Athanasios Diakos. But the Ottoman advance was stopped at the inn of Gravia, under the leadership of Odysseas Androutsos, who was subsequently named commander-in-chief of Eastern Greece. Vryonis turned towards Boeotia and sacked Livadia, awaiting reinforcements before proceeding towards the Morea. These forces, 8,000 men under Beyran Pasha, were however met and defeated at the Battle of Vassilika, on August 26. This defeat forced Vryonis too to withdraw, securing both Eastern Greece and the Morea.