Oman, Charles William Chadwick Sir 1860-1946.
A history of the art of war in the Middle Ages /
Charles Oman 
. - 2nd edition, revised and enlarged 
. - New York : Burt Franklin,  1924- 
. - 2 v.  23 cm. 
<br/> V. 1. A.D. 378-1278  <br/>  V. 2. 1278-1485. <br/>