After his accession as Elector, he reduced the size of the royal household and began with
the establishment of a small
standing army of 12,000 men, after the model of the
Margraviate of Brandenburg and managed to extract from the states of the realm a commitment to contribute funds. The Privy War Chancellery (
geheime Kriegskanzlei) was set up as the highest military authority. Extreme pressure was used to obtain recruits for the new army. He always neglected home affairs. In foreign policy, he was less inconstant than his father. He broke off relations with the French crown and strove energetically to win Brandenburg and other German princes for the
Imperial war against the French aggressor. Valued as an ally by the Habsburg court, he was nevertheless viewed with extreme distrust and was not able to overall command of all the imperial troops in the face of a Turkish invasion and he did not obtain the means (food supply and winter accommodation) necessary for the maintenance of his auxiliary troops. There was also the matter of John George's wish for
Emperor Leopold I to decide a law case concerning a wooded area in the
Ore Mountains (
Erzgebirge) in his favour. The Emperor did not grant material support until the
siege of Vienna made his situation look increasingly desperate. John George eventually 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 with 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. In the ensuing Battle of Vienna (12 September 1683) he commanded the left wing, where he demonstrated great personal courage. The battle call selected by the emperor "
Maria Help" (which might carry
Roman Catholic connotations) had been previously amended to "Jesus and Maria help" at the request of John George. King
John III Sobieski of
Poland-Lithuainia, who also took part in the battle, said of John George: "
the Elector of Saxony is an honest man with a straight heart". John George also accompanied the Emperor after the victory when he entered Vienna. But on 15 September, without taking leave of the Emperor or the other commanders, he set off with his troops on the march back to Saxony, probably as a result of the brusque treatment he had been accorded as a Protestant. In 1686 he again supported
Leopold's Turkish War. For payment of 300,000
thalers, he sent a troop of 5,000 men to the Emperor. In 1685 he had already hired out 3,000 Saxon nationals for 120,000 thalers to the
Republic of Venice for their
Morean War on the Greek
Peloponnese Peninsula. He did not join the
League of Augsburg of 1686 against
France, but he did travel personally to
The Hague in March 1688, to discuss with Prince
William III of Orange,
George William, Duke of Brunswick-Lüneburg, and
Frederick William, Elector of Brandenburg possible moves against
Louis XIV. However, he did not directly support the forthcoming assumption of the English throne by
William III. Following a renewed
invasion by France in (1689), he again led his troops into battle to protect
Franconia. He later joined the army of
Charles V, Duke of Lorraine and took part in the siege of Mainz. 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
Aeneas de 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. He was buried in the
Cathedral of Freiberg. ==Children==