 Complete the following phrase:  The Powers agreed, by the Treaty of London 1827, to force the Ottoman government to grant the Greeks autonomy within the empire and despatched naval squadrons to Greece to enforce their policy. The decisive Allied naval victory at the Battle of Navarino broke the military power of the Ottomans and their Egyptian allies. Victory saved the fledgling Greek Republic from collapse. But it required two more military interventions, by Russia in the form of the Russo-Turkish War of 182829 and by a 