U-Boat 29 (1939)

None.

You can see a soldier with blood on his face after a fight.

Lots of smoking (pipes, cigarettes, and cigars) and smoking references. For instance, two men walk into a restaurant full of smoke (from people smoking obviously) and take a deep breath and make comments about how they haven't smoked in days (submariners from the navy on leave and with a tobacco shortage caused by the war).

Also a moderately plentiful amount of drinking.

Nothing frightening.

A German spy's identity is found out by the British and he is trying to escape. Some of these scenes are slightly intense.