Teacher:Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
Teacher: Now, understand the problem? Solve this instance: The Battle of Rain, or Lech, on April 15th 1632 in which the Swedes under Gustavus Adolphus beat the forces of the Holy Roman Empire was part of which war?
Student:
thirty years' war