Unfortunately smartphones with cameras (and the annoying persons looking at them all the time) were invented just a few years after swords and such went out of fashion.
If you trust the British (who wouldn't?), for decapitations and related stuff you can take a look at the wonderful book "Swordsmen of the British Empire" by D.A. Kinsley, it's, albeit sometimes a bit chaotic, full of very interesting near contempory reports (mostly 19th century) and worth any cent.