1) The Greatest General

Alexander, he was undefeated.

2) The Greatest Army

The Mongol Horde

3) The Greatest Campaign

Alexander taking Asia

4) The Greatest Battle (tactics-wise)

D-day, not for battle field tactics, but the amount of preparation that went in to this manoeuvre is so staggering it deserves the title.

5) The Greatest Battle (purely for heroics)

Thermopylae

6) Greatest Rivalry

US\USSR : the whole world feared destruction

7) Biggest Upset

Carthage not sending enough support for Hannibal

8) Most glorious victory

Alexander finally destroying the Persian empire.

9) The Worst Error

Invading Russia

10) Your favorite area of military history

Any and all