On July 19th 1702, a Swedish army of 12,000 defeated a combined Saxon Polish army of 23,000. The Swedes simply had better soldiery and leadership.
Sweden
Charles XII
12,000 men
4 cannons
18 infantry battalions, 25 cavalry squadrons, and 12 dragoon squadrons.
Saxons
Augustus II
16,500 Saxons
6,800 Poles
50 guns
16 battalions, 44 cavalry squadrons, 24 dragoons, 26 Polish squadrons
Wargame
Use any 1700’s ruleset
2-6 players
4×8 table with lots of woods, swamps, and rivers , one key central hill, one Saxon camp
Objective
The Swedes must either secure the central hill or the Saxon camp. Either is a victory. I’d recommend giving the Swedes slightly improved units.