question: How many years after the capture of the king at the Battle of Poitiers did John de Montfort return to Brittany?
#1 return the  captures of the   king at the Battle of  Poitiers 
#2 return John de Montfort did return to Brittany 
#3 return year of #1 
#4 return year of #2 
#5 return difference of #4 and  #3