 Johann Georg even led his 10,400 strong army against the Turks.However, there was strong opposition from the estates of Saxony, not only because this expensive campaign was exhausting the finances of the Electorate of Saxony but also because they were not pleased at this support for the catholic Emperor, who had often proceeded harshly against Protestants in his own country.At Tulln, on the Danube, he joined the Imperial army and they set off for the relief of Vienna.