Michael Cash wrote:

> The thing is, though, one needn't necessarily sink it to take it out.
> These days practically every torpedo is of the acoustic homing
> variety, which means they will be running for the screws. Bash the
> screws and rudder enough and you severely hamper or destroy mobility,
> which denies the effective use of the unit, which for tactical
> purposes "takes it out".
> 
> The screws and rudder are the Achilles heel.
> 
> 

Interesting, and quite obvious when it's explained. That was how 
the German battleship whos name esacapes me was crippled. Not the 
Graf Spree, not the Hindenburg ...