Task: Question Generation
Input (English): #1 return the  Siege of Derry 
#2 return the  encounter at Dromore County Down 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return difference of #3 and  #4 in  months
Output (English): How many months after the Siege of Derry did the encounter at Dromore County Down take place?