### Instruction:
When did Christoph Karl von Piacsek serve as a Hungarian officer?

### Input:
Christoph Karl von Piacsek was a Hungarian officer in Habsburg military service during the French Revolutionary Wars. He was born in 1749 in Klobusics (Hungarian: Klobusic; Czech: Klobušice), in the commune of Trencsén, in the Kingdom of Hungary. As a Rittmeister, or captain of cavalry, in the 9th Hussar Regiment, he received the Knight's Cross of the Military Order of Maria Theresa in 1789, after combat in Tabor during Austria's wars with the Ottoman Empire, and, as a colonel, commanded the 9th Hussars, 1793–1797. In 1793, during the War of the First Coalition, the 9th Hussars were part of the Army of the Rhine (Austrian), and participated in the skirmishes at Offenbach, Knittelsbach, and Otterheim, and, later, at the storming of the Wissembourg line at Lauffenberg. Following this action, Piacsek, Major Baron von Szoreyny, and several other officers were honored.

### Response:
Christoph Karl von Piacsek served as a Hungarian officer in Habsburg military service during the French Revolutionary Wars.