Duck Hunt 1945 (Click "Play this Game") I don't know if it will work on Macs. Make sure you use cover (up and down arrows) and reload (CTRL) and mouse to aim.

BTW, here is the proper order to watch the Horatio Hornblower DVDs for those interested:

Duel (first one)

Fire Ship

Wrong War

Duchess and the Devil

Mutiny

Retribution

Loyalty

Duty (last one)