Cheat Mode
Type THUNDER (or WINTER if you have version 1.51) while playing the game, You will see an exclamation mark and this enables some cheats:
[Alt][F7] - Reveals the entire map
[Alt][1] through [Alt][6] - Changes the speed of the game.
You can edit the .rtx files in the directory SETTLERS2\DATA\ MISSIONS as per below:
!ADD_WARE 0 20 Make !ADD_WARE 0 199
!ADD_WARE 1 50 Make !ADD_WARE 1 199
!ADD_WARE 2 46 Make !ADD_WARE 2 199 etc
!ADD_PEOPLE 0 100 Make !ADD_PEOPLE 0 199
!ADD_PEOPLE 1 4 Make !ADD_PEOPLE 1 99
!ADD_PEOPLE 2 2 Make !ADD_PEOPLE 2 99 etc.
Notice you can change people 0 (unemployed guys) to 199 OK! You'll start with some 298 privates and 99 of the other soldiers due to the 199 swords and shields being allocated to the 199 unemployed guys.
EditCheat
Go to the Settlers2 savegame directory and type edit mission.dat Remove everything and type 1111111111 and save it under the same name. If everything has gone right you can play all of the ten missions.