After the Ottoman Empire's capitulation in the war, he conspired with several Ottoman army deserters to start a Muslim insurgence in the Rhodope mountains. Their propaganda efforts aimed to scare Turkish villagers with the rising "rule of the infidels" and make them believe there would soon be retributions for the massacres of Christians during the April uprising in Bulgaria. The anti-Bulgarian and anti-Russian nature of Saint Clair's activities soon found the implicit support of the Ottoman and the British empires, both of them hoping to revise the Treaty of San Stefano on terms favourable to Turkey.