How many years passed between the Battle of Vienna and the Austrian branch of the Holy League reached the Plain of Skopje?
return the  Battle of   Vienna ;return the  Austrian branch of   the   Holy League reached the    Plain of Skopje ;return year of   #1 ;return year of   #2 ;return difference of   #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']