In the spring of 1445, de Wavrin sailed to the Danube to join the Hungarians in the continuing Crusade of Varna while de Thoisy took his ships along the south coast of the Black Sea.
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Next, in response to the Byzantine appeal for help against the Ottoman advance, Philip instructed de Thoisy to lead his squadron to reinforce a squadron of four galleys built or hired at Nice and Venice, commanded by Waleran de Wavrin, to join Pope Eugene IVs planned Crusade.
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