 However, he also denounced attempts to restore Charles by force.The previous day, Charles had made a flight (the plane's engine stopped working several times) from Dübendorf airport in an Ad Astra Aero Junkers F 13 monoplane, landing surreptitiously in western Hungary.On 23 October, a Treaty of Versailles-mandated plebiscite was scheduled to occur in the Burgenland (with a choice between Austria and Hungary on offer), and in mid-October Colonel Lehár, Count Gyula Ostenburg-Moravek, and other legitimist officers had decided to take advantage of the tense situation, sending Charles a message that he should try to seize power before 23 October.