In Southern Macedonia, the chieftains of Mount Olympos and fighters from independent Greece and Thessaly and Magnesia captured the Vale of Tempe and some parts of Pieria. In Western Macedonia, the revolutionaries led by Theodoros Ziakas took control of the western Pindus and attacked the area of Grevena, but the numerical superiority of the Ottoman army and the hostile stance of the United Kingdom and France resulted in the signing of an armistice and the return of the chieftains to Greece on June 1854.