1) The Greatest General-Rommel

2) The Greatest Army-German WW1

3) The Greatest Campaign-The US pacific campaign... although it may be broken up into several campaigns

4) The Greatest Battle (tactics-wise)-Kiev 1941

5) The Greatest Battle (purely for heroics)-Gettysberg

6) Greatest Rivalry-Monty/Rommel

7) Biggest Upset-Japan losing to America... they had such high hopes..

8) Most glorious victory-Waterloo

9) The Worst Error-Kiev 1941- Huge tactical victory, but diverted troops from the drive toward moscow and extended the war.. costing Germany victory in ww2.

10) Your favorite area of military history-WW2