By the summer of 1829, the Peloponnese, parts of Central Greece and several islands had been liberated by Greek revolutionary forces. A peace treaty between the Sublime Porte and the revolutionaries was imminent but it became apparent that the soon to be created Greek state would be limited to whatever lands had been liberated during the war. In August, Aslan Bey and Osman Aga set off from Athens after leaving behind a small garrison with a force of 7,000 Ottoman Albanians to fight the Russians in Thrace.