The momentous events of the next three years, which drew all Europe into the conflict with Napoleon and culminated in his final overthrow at Waterloo (June 18, 1815), put a temporary check upon the further development of Jahn’s work at the Hasenheide, at the same time that they emphasized its value. On March 17, 1813, King Frederick-William III of Prussia declared war upon France and appealed to his people to join in the great War of Liberation. Jahn was among the first to respond. He entered Lützow’s famous Free Corps, and his example was quickly followed by most of the turners who were old enough to bear arms. Although he made occasional visits to the Turnplatz in 1813 and 1814, and remained in Berlin during the campaign of 1815 to watch over the work there, he had entrusted it, before joining the Corps, to lottery director Johann J. W. Bornemann, who had shown great interest in the movement. He had also persuaded one of his earliest and most capable pupils, Ernst Eiselen, the state of whose health incapacitated him for military service, to undertake the direction of the exercises, and this position Eiselen seems to have retained throughout the three seasons. At the suggestion of Minister von Schuckmann and with the approval of Chancellor Hardenberg, Jahn’s annual allowance was increased from 500 to 800 thalers, Eiselen was provided with a salary of 400 thalers, and for the support of the Turnplatz a yearly grant of 150 thalers was made, together with free timber for building purposes.