How many months after the Battle of Fontenoy did the fortress of Tournay surrender to the French?
return the  Battle of Fontenoy ;return the  fortress of Tournay did surrender to the   French ;return when  was  #1 ;return when  was  #2 ;return difference of #3 and  #4 in  months
['select', 'select', 'project', 'project', 'arithmetic']