How many days passed between the appearance of advanced detachments and the arrival of the main forces of the Turks?
return the  appearance of   advanced detachments ;return the  arrival of   the   main forces of the    Turks ;return when  was  #1 ;return when  was  #2 ;return difference of   #3 and  #4 in  days
['select', 'select', 'project', 'project', 'arithmetic']