Generate a correct and concise answer for the question based on the words in the context.

Context : M. Waldo Hatler (January 6, 1894 - August 31, 1967) was a Sergeant in the United States Army during World War I who received the Medal of Honor for heroism near Pouilly, France, November 8, 1918. 
Question : In what war was M. Waldo Hatler a combatant?
World War I

Context : Tuor remained in Gondolin, and wed Turgon's daughter, Idril Celebrindal. 
Question : What is Tuor's spouse's name?
Idril

Context : The 2015 Uttar Pradesh train accident occurred on 20 March 2015. 
Question : What is the date when 2015 Uttar Pradesh train accident happened?

20 March 2015