You must hate a Frenchman as you do the devil

Treat every Frenchman as if he was the devil himself.

Firstly you must always implicitly obey orders, without attempting to form any opinion of your own regarding their propriety. Secondly, you must consider every man your enemy who speaks ill of your king; and thirdly you must hate a Frenchman as you hate the devil.

treat every frenchman as if he was the devil himself

England expects that every man will do his duty.

If a man consults whether he is to fight, when he has the power in his own hands, it is certain that his opinion is against fighting.