Interestingly, and somewhat strangely, infantry rarely fired when in square and on the rare occassions when cavalry actually managed to break a square, it was usually due to some freak accident rather than courage or determination.
There are some really interesting eyewitness accounts of cavalry v infantry in square amongst the Waterloo letters, and Hofshoerer's books on the Waterloo Campaign also has some first hand accounts from official Prussian Army reports.
The thing that is unrealistic is the point made by Antisocialmunkey e.g. Real horses aren't stupid, and can't be trained to be stupid. Its that more than anything that makes a square a good defence against cavalry.
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