European History Question: Can anyone help me find examples?

I need to submit a thesis for my euro class, and it has to be really unique. I have the idea of what I want to do -- that military leaders are considered crazy if they lose and geniuses if they win. I really want to use it as my thesis proposal, but I'm having trouble finding things to back it up. They have to be european. Do you guys have any ideas? (& can you please put the sources, too?) Thanks!!!
 
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