The BBC has a nice little game on their site which has kept me amused called Battlefield Academy.
Pit your wits against the remorseless Artificial Intelligence engine of the Battlefield Academy, in four challenging historical missions.
The computer will be your enemy as you seek to gain tactical battlefield experience. You will only graduate when you have won every mission.
To help you succeed, some of the greatest commanders in history will be on hand to give you tactical advice - and the best players will be entered into each mission's High Score Table.