How many years passed between the Swedes marching under Claude Collart and marching through the valley Østerdalen?
return the  Swedes marching  under Claude Collart ;return marching  through the  valley Østerdalen ;return when  was  #1 ;return when  was  #2 ;return difference of #4 and  #3 in  years
['select', 'select', 'project', 'project', 'arithmetic']