This can be done in local coop.
Just load up a Skulls Local game with Match Type of Team Deathmatch. Time set to unlimited and starting rice at 1000. Choose a small map. Select 3 additional "Hot Seat" players.
Once the game has loaded just move the calvary and archery units of yours and your teammates toward the opponents. Activate the enemy Generals and move them toward your team players and take them out. (Thanks to Humpyrton for this) [Strike]You only need to take out the front line and then your archers can hit the generals. [/Strike]
5 minutes max.
You can build additional units if you like, but its not necessary.