Task: Question Generation
Input (English): #1 return a French group of   gunners led by Chevalier Milard participated to the  Burmese invasions of Siam as an elite corps of  the Burmese  army 
#2 return years of   #1 
#3 return number of  #2
Output (English): How many years did a French group of gunners led by Chevalier Milard participated to the Burmese invasions of Siam, as an elite corps of the Burmese army?