How many years after being named commander of Nafplion did Von Heideck go back to the Bavarian army?
return Von Heideck was  named commander of Nafplion ;return Von Heideck did go back to the  Bavarian army ;return year of #1 ;return year of #2 ;return difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']