Task: Question Generation
Input (English): #1 return the  Battle of Changde 
#2 return the  Allied attack in  Italy 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return difference of #3 and  #4 in  months
Output (English): How many months passed between the Battle of Changde and the Allied attack in Italy?