question: The Battle of Ostrach, occurred on 20–21 March 1799, which Austrian field-marshal,had victory in the battle, under his command?
answer: Archduke Charles of Austria, Duke of Teschen
context: Title: Archduke Charles, Duke of Teschen
  Passage: Archduke Charles of Austria, Duke of Teschen (German: Erzherzog Carl Ludwig Johann Joseph Laurentius von Österreich, Herzog von Teschen; 5 September 1771 – 30 April 1847) was an Austrian field-marshal, the third son of Emperor Leopold II and his wife, Maria Luisa of Spain.  He was also the younger brother of Francis II, Holy Roman Emperor.  Despite being epileptic, Charles achieved respect both as a commander and as a reformer of the Austrian army.  He was considered one of Napoleon's most formidable opponents.
  Title: Battle of Ostrach
  Passage: The Battle of Ostrach, also called the Battle by Ostrach, occurred on 20–21 March 1799.  It was the first battle of the War of the Second Coalition.  The battle resulted in the victory of the Austrian forces, under the command of Archduke Charles, over the French forces, commanded by Jean Baptiste Jourdan.
  Title: Charles Mayer (composer)
  Passage: Charles Mayer (21 March 1799 in Königsberg – 2 July 1862 in Dresden), also known as Carl Mayer or Charles Meyer, was a Prussian pianist and composer active in the early 19th century.
citations: Archduke Charles, Duke of Teschen Battle of Ostrach