I think it's more individual moments than overall battles for me.
> Sneaking scythes into rear areas and blowing up Singus is a particular favourite of mine. Once I managed to get 3 close together and singlehandedly won the battle
> Setting up a Bertha dance session on top of a hill, and then opening the dance card by concentrating fire from 3-4 big girls on shield balls, porc and energy structures. I once managed to mow down a Detriment :D
> Coordinating with team members to roll forward an irresistible attack. When you have guys that know what they are doing, each can take a specific role and you can fulfil it without even much communication. For example, the air player Thunderbirds, I sweep in with skirmishers, mess up the units and then run into porc. I retreat but here comes player #3 with the artillery to destroy the porc. I protect the arty with skirkishers while he reduces the defences and the air player is en route again with the emp ... :) Happy times.