Delbru??ck, Hans,  1848-1929 <br/><br/>
Numbers in history :  how the Greeks defeated the Persians the Romans conquered the world the teutons overthrew the Roman empire and William the norman tack possession of England / 
Hans Delbruck 
 - Oxford :  Clarendon Press,  1913 
<br/><br/><label>Subjects--Topical Terms: </label><br/>History<br/>Military History