The Ancient Art of War cheats 

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Keeping the Enemy From Multiplying
cheat 
In this game, only 20 squads can be on the war map at any one time. 
You can keep your opponent from training more men by detaching squads (preferably in your fort) until the 20-squad limit is reached. 
Whenever one of your squads is wiped out, detach another one to retain the 20-squad limit. 
Ford attack hint
hint 
Send Two Squads Against Forts Using archers alone to overrun a fort can inflict a lot of casualties on your army. Instead, send two or more groups with a few men each just to occupy the enemy archers on the wall. 
Then, send in your regular units. They'll be able to sneak over the wall while the enemy is already engaged, and then the battle will take place in the courtyard, where you have better odds of winning. 
The Coward's Way To Inflict Casualties:
hint 
If your archer is outnumbered while fighting another squad, fire a barrage of arrows and then retreat. The arrows still move even after your men are safely off-screen, so you can whittle down enemy forces without taking any casualties of your own. 
Don't Zoom In When Non-Archer Squads Attack Forts
hint 
Armies can't retreat unless you press the Zoom button during the battle. 
So, if an enemy squad is dumb enough to attack your fort without any archers, don't zoom in to see the battle. 
The attackers won't be able to retreat, so they'll eventually all be killed. 
You Don't Need A Whole Squad To Capture A Flag
hint 
You can capture a flag without tying up an entire squad. Just detach one man into a new squad, then just send him to the flag. As long as there is no enemy lurking nearby, a single soldier works as well as a full squad. 
Exporting Graphics
hint 
If you try to create a screen dump using the standard Command-Shift-3 combination, it won't work. Command-Enter takes a PICT file screen snapshot, which you can then edit into any graphics file.