Following the fall of Missolonghi in western Greece, Athens and the Acropolis remained the only strongholds in Greek hands in mainland Greece outside the Peloponnese. Consequently, after his victory at Missolonghi, the Ottoman commander-in-chief, Reşid Mehmed Pasha, turned against Athens. The siege began at 25th August 1826, and followed closely the experience of Missolonghi: the Ottomans set up a very close blockade and bombarded the hill, while the besieged harassed them with frequent night sorties and mining, utilizing the expertise of Konstantinos Chormivitis, who had already distinguished himself in Missolonghi. The Beleaguered Greeks were resupplied and reinforced by small detachments sent through the Ottoman lines by the main Greek army, under Georgios Karaiskakis, which had established itself around Eleusis, Piraeus and Phaleron to the south of Athens. The Greeks launched various attacks against the Ottoman army's rear and its supply lines, most notably the victory at the Battle of Arachova in November ; this strategy was altered in favour of direct attacks on the Ottoman army, resulting in the Battle of Kamatero in February. The command was transferred from Karaiskakis to the British general Richard Church in April.