The Siege of Tripolitsa was a key battle in the war for Greek independence and one of the earlier battles as well. Tripolitsa was an important centre in the Peloponeese for the Greek army so the Ottoman troops decided to invade under the command of Mustafa Bey. General Kolokotronis launched a massive attack in September after negotiations failed with the Ottomans. The massacre left many dead on both sides but eventually the Greeks came out on top and regained control of the city.