Conversation so far:
What sort of achievements did the Archduke Charles, Duke of Teschen have?
Despite being epileptic, Archduke Charles, Duke of Teschen achieved respect as a commander and as a reformer of the Austrian army. He was considered one of Napoleon's more formidable opponents.
How long did the Archduke Charles, Duke of Teschen reign?
Archduke Charles, Duke of Teschen reigned from 1792 to 1809.
How did the Archduke Charles, Duke of Teschen become Duke?
Archduke Charles, Duke of Teschen's father permitted Charles's childless aunt and her husband to adopt and raise the boy. In 1822 he succeeded to the duchy of Saxe-Teschen.

Question: What other achievements did he have that you can tell me about?
Self-contained rewrite: What other achievements did the Archduke Charles, Duke of Teschen have that you can tell me about?