 He later had to leave the theatre because of an illness but, against the advice of his physicians and advisors, he returned in May 1690 and with a reinforced alliance with the Emperor, took overall command of the imperial army.Success was limited, however, partly owing to personal skirmishes between John George, the Field Marshal Hans Adam von Schöning and the Austrian commander Caprara; only the crossing of the Rhine at Sandhofen succeeded.John George died shortly after in Tübingen, where he had been brought, of an epidemic illness, probably Cholera or the Plague.