1. Launch the game and choose whatever graphics you want.
2. Open preferences file and change the unit size to 2 AND change to 3 (change to ultra) the size of game units (itīs a line at the bottom of preferences)
3. Save the modified file AND protect it against writing (right click on preferences file, then properties, then choose "Read only", CLICK APPLY and the accept)
4. Now launch the game, AND DONīT OPEN THE OPTIONS OR GRAPHICAL OPTIONS WILL BE RESET, and start a campaign. You should then get whatever number of men you wanted.
More detailed instructions can be found in the NTW modding tutorials (regarding changing unit size. NTW tutorials about this are valid for ETW).