Though I would like to believe in the romance of the wings being worn in battle, I think that Jamaz makes good points. Here is a link, How the Hussars fought in the 17th century. No mention of wings, but they did have some very effective battle strategies!
I am still looking for wings in battle. I also want to comment on the head dresses worn by many American Indians also made of eagle feathers and looking very much like the Hussars' wings.
Will find some pictures.