on 21–22 May, and the Battle of Wagram on 5–6 July. He took command of the main army after Archduke Charles resigned and held this responsibility until the end of the year. Emperor Francis II promoted him Feldmarschall in September. He negotiated and signed the Peace of Schönbrunn. Both of these treaties were very favourable to Napoleon and hard on Austria. Afterward, Liechtenstein was accused of having little diplomatic skill. To escape criticism he resigned from the military in 1810. Sovereign As Prince of Liechtenstein, Johann made forward-thinking reforms, but also had an absolutist governing style. In 1818 he granted a constitution, although it was limited in its nature. He expanded agriculture and forestry and radically reorganized his administration, in an attempt to take the requirements of what was then a modern estate into account. He proved a trendsetter in the area of garden art by planting Biedermeier gardens and park landscapes in an English model. In 1806 Napoleon incorporated Liechtenstein in the Confederation of the Rhine and made it a sovereign state. At the Vienna Congress the sovereignty of Liechtenstein was approved. Liechtenstein became a member of the German Confederation in 1815. This membership confirmed Liechtenstein's sovereignty. Marriage and issue On 12 April 1792 in Vienna, he married Landgravine Josepha of Fürstenberg-Weitra (Vienna, 21 June 1776 – Vienna, 23 February 1848), Dame of the Imperial Court and Dame of the Order of the Starry Cross. They had 14 children: Princess Maria Leopoldine Josepha Sophia Aemiliana (Vienna, 11 September 1793 – Vienna, 28 July 1808) Princess Karoline (Vienna, 2 February 1795 – died in infancy) Aloys II, Prince of Liechtenstein (1796–1858) Princess Maria Sophie Josepha (Vienna, 5 September 1798 – Vienna, 27 June 1869), married in Vienna on 4 August 1817 Vincenz Graf Esterházy von Galántha (Pressburg, 25 October 1787 – Eisgrub, 19 October 1835), without issue Princess Maria Josepha (Vienna, 11 January 1800 – Vienna, 14 June 1884), unmarried and without issue Prince Franz de Paula of Liechtenstein (1802–1887), married Countess Julia Potocka and had issue. His great-grandson would eventually become Prince Franz Joseph II. Prince Karl Johann of Liechtenstein (1803–1871). Married Gräfin Rosalie d'Hemricourt von Grünne and had issue. Princess Klothilda Leopoldina Josepha (Vienna, 19 August 1804 – Vienna, 27 January 1807) Princess Henriette (Vienna, 1 April 1806 – Ischl, 15 June 1886), married in Vienna on 1 October 1825 Joseph Graf Hunyady von Kethély (Vienna, 13 January