Old book.  Hard back.  Beat up.  PF Collier and Sons "The Works of A Conan Doyle"  Volume 3 "The White Company"  No ISBN on the book, no date of publication. 

This spirited account of the exploits of a crew of Saxon archers during the Hundred Years War features cameo appearances by historical figures such as Edward III and the Black Prince. Flavorful and realistic in its depictions of medieval life, the novel combines the excitement of a rugged adventure with the romance of chivalry.