If you begin the game at the lowest castle, move all your men in your army and take the 3 high vassal/income territories below. This will give you a lot of men in your army. Moved back to your castle you will also be able to buy lots of men.
When sword fighting move forward, backward, strike, and repeat, you should beat your opponents with no problems.
Move your lance until it is just left of your opponents shield, then down a little. Count the number of bounces and on the 5th strike at the lowest possible point.
I was only able to get the first one of these to work.
While the game is loading hold down the 'K' key until the game is loaded. You should now start the game with 2048 knight.
To get 1,024 Knights: After conquering a territory, press these four keys at the same time, while the drive is still running: 'H', 'J', 'K', 'L' or only 'K' ? If you do it just right, you'll have 1,024 knights both in your home and in your army.