During
World War I Maximilian served as a major in the
Austro-Hungarian Army. He also had the rank of
corvette captain in the
Austro-Hungarian Navy. In February 1917, Maximilian was sent to
Berlin to formally notify the German Emperor
Wilhelm II of the accession of Maximilian's brother Charles as Emperor of Austria. In 1917 / 1918, with consent of Charles I, Maximilian established his household at
Belvedere Palace in Vienna, held to the disposition of the imperial family by the government of Austria. In June 1918, Maximilian led the Austrian assault on the
Dosso Alto. The air pressure of a shell which landed near him broke his ear-drum and caused a certain deafness. Maximilian was decorated with the Grand Cross of the
Order of Leopold (with the war decoration and swords) for the Austrian victory. However, in August the Italians re-captured the Dosso Alto. After the end of
World War I, in December 1918 some monarchists suggested that he succeed his brother as emperor. As Charles I, not anymore participating in state affairs since November 12, 1918, still considered himself emperor, this suggestion did not conform to the family rules of the dynasty. Meanwhile, on 12 November 1918, the Provisional National Assembly of German Austria declared the country a republic. On 3 April 1919, the Constitutional National Assembly elected in February passed the Habsburg Law which stipulated members of the former ruling family could only live in Austria if they cancelled their membership to the Habsburg Dynasty with its monarchial aspirations and if they declared themselves loyal citizens of the republic. Maximilian obviously preferred to live outside of Austria, following the example of the last imperial couple.
Life in exile Maximilian Eugen and his family in 1919 were given permission to live in
Switzerland on condition that he did not engage in political activity. after which Zita and her children returned to mainland Europe. In June 1923 Maximilian sued his late brother's secretary Baron von Steiner for fraud in the sale of some family jewels. In November 1930 Maximilian attended the ceremony in
Ham, Belgium commemorating the coming-of-age of his nephew
Otto, from then onwards until 1 January 2007
chief of the House of Habsburg-Lorraine. In November 1933 the government of the Republic of Austria under chancellor
Engelbert Dollfuss, who earlier this year had declared the parliament to have dissolved itself and did not undertake any action to hold elections, gave permission for Maximilian to reside in Austria. On 27 April 1945, the second Republic of Austria returned to the republican laws valid before dictatorial rule. ==Personal life==