Here's a good army that I used to beat an American army last night on grassy flats. The Rules were no artillery (HATE that), but at least my opponent didn't take Light Goons, which is my greatest hate of all...
1x 2nd Hussars as general
4x Death's Head Hussars
6x Line infantry (1 with 1 vet)
5x Prussian Jaegers
It was up against an American army that was also pretty good and went something like this:
1x General's Bodyguard
4x Household Cavalry
3x Line infantry
6x Long Riflemen
In short, I moved my cavalry and general to his flanks while he camped in his zone in a very basic line formation with his cavalry moving to the flanks to guard against my own cavalry. Seeing his cavalry as inferior, I rushed in from both sides while my riflemen moved the left side of his line (the side with no guards), trying to distract the hidden long riflemen I knew had to be somewhere.
My opponent was not distracted, and used 3 long riflemen on each flank in front of his horse contingents to ambush my superior cavalry before it arrived to deal death, but it still arrived and dealt much death in any case, this time to his long riflemen. The horse guards joined the fight, but the Death's heads proved an equal foe. On the side in which my general joined the charge, the longriflemen and most of the enemy cavalry was annihilated. On my weaker left flank, my cavalry halved his longriflemen and routed one of his house cavalry. He then foolishly charged the remaining cavalry on that side into my 5 riflemen, who dispatched them with daggers and laughter.
The rest of the match was some carefully-timed line maneuvering, but in the end I emerged victorious with 3 very depleted riflemen and 1 68 man line infantry unit still on the field.