In the first game I took an overwhelmingly superior Seleukid army (superior in both numbers and, for the most part, quality) against some Hellenistic Spartans. The Spartans were tasked with defending a fordable river while my boys were required to force a crossing.
We were playing on a very narrow front so my numbers were somewhat obsolete. In the shot above you can see Conor's Spartans moving up to defend the river.
He made a bit of a gaff by sending his lighter thureophoroi to take control of the hill and left some of his heavy ex-helot and Periokoi pike units to hold the wood on his right.
I pushed a light division of infantry towards the wood and some light cavalry towards my extreme right, to head around the hill.
Sending my light infantry across the river to secure a beachhead in the woods, and my light cavalry across the river on the far right, I hit the thureophoroi with my trio of scythed chariot goodness. Their pointy wrath was enough to weaken the Spartan's mercenaries before I sent my heavy cavalry across the extinguish their pitiful existence.
With the Spartan left wing completely destroyed the Seleukid cavalry surged down on the Spartan centre. In a desperate and misguided dash, the Spartan centre tried to take the offensive and plunged into the river - going into open order to try to get across.
As the light infantry held on doggedly in the woods, the open order Spartan phalangites in the river proved to be easy pickings for the Seleukid heavy horse and the battle was more or less over. The river could have proved a real obstacle to my lads, but in the end it caused the destruction of the Spartan centre.
The second game, playtesting Irregular Wars (2nd ed.) saw Conor take the Colonial Spanish against my Miskito Indians. As Conor hadn't played the game before, I was at a distinct advantage and I suspect that my narrow victory might have been much narrower had he been more familiar with the rules.