While working my Google-Fu trying to find information on Caroline von Holnstein, I ran into this:
Articles about Edwardian women defending themselves against harassers using their elegant hatpins (And the lawmakers who panicked and starting outlawing long hatpins)
I remember that hairsticks for self defense have been discussed on LHC many times. And to be honest, some of the ones I have could do some serious damage...
Anyways. This was a fun, frustrating and enlightening read, so here are some links:
The hatpin peril
The sting of a hornet
The hatpin as a lady's weapon of choice
Call the fashion police! I'm wearing an illegal hatpin!