Keith Durham: The Border Reivers [1995] paperback

This is an account of the uniforms, insignia, weaponry, campaigns and military practices of the border reivers, the guerrilla soldiers who ran wild in the Marches of England and Scotland between the 13th and 17th centuries, and who for a while produced the best cavalry of their time, playing a decisive role in such battles as Flodden and Solway Moss.