Conversation so far:
what is a common local holiday in the philippines
The Day of Valor on April 9th is a common holiday in the Philippines.
What does Day of Valor commemorate
Day of Valor or Bataan Day is a national observance in the Philippines which commemorates the fall of Bataan during World War II.
Who fought in the Battle of Bataan
The Battle of Bataan was a battle fought by the United States and the Philippine Commonwealth against Japan during World War II

Question: When did the battle take place
Self-contained rewrite: When did the Battle of Bataan take place