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The story is from Robert Walser's account (1908) of the Battle of Sempach (1386):
Fine noblemen drowned in their hundreds; no, they were drownded in the nearby Lake of Sempach; they were drownded because they were pushed into the water like cats and dogs. They overbalanced and fell over one another in their elegant pointed shoesโit was a real shame..... Many knights, in the abruptness of their desire to dismount, got caught up in the stirrups with their silly but fashionable footwear and were left hanging from them so that they bumped themselves over the grass bleeding from the backs of their heads.... The battle of Sempach teaches us, in fact, how dreadfully stupid it is to wrap up well. If only those puppets had been able to move, yes, they would have done.
This was a gross exaggeration, however. What the chronicles actually say is that the knights simply cut off the points of their shoes (which were leather) as they assembled on the field before the battle.