Forget the History Channel...
To get acquainted with military tactics, one useful read is the Osprey line of books...
While being beautifully illustrated (Angus McBride for most of them, enough is said), those books give insight on troop types and army evolution, battle reports, description of castles and citadels...
Look here :
http://www.ospreypublishing.com/
And some free articles about the period :
http://www.ospreypublishing.com/content4.php/cid=65
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