Ten things I learned from Dunkirk

1. It is best not to shelter in a leaking boat

2. It is easy to bang one's head in a small boat than a big one

3. What looks like 30 small boats or so can quickly rescue 300,000

4. It is a relatively easy to shoot down other planes and they all go down the same way

5. A Spitfire can glide for a long time and still attack the enemy

6. The French are untrustworthy

7. Jam sandwiches are best for injured and exhausted men

8. Only three Spitfires need attack the enemy to make a difference

9. Germans only bombed opposing armies using one or two planes at a time as it was more efficient.

10. Overt emotionalising can detract from the end of a film.