How many days after King George II authorised the Admiralty Board to seek maritime reprisals against Spain did Vice Admiral Edward Vernon and a fleet of warships departed Britain?
return King George II authorised the  Admiralty Board to seek maritime reprisals against Spain ;return Vice Admiral Edward Vernon and  a fleet of warships departed Britain ;return day of #1 ;return day of #2 ;return the  difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']