Great pictures!
I really enjoy the game as well, although I have to say I don't think I've ever seen a unit survive to the last man.
As units take hits, even hits that don't remove casualties, they also acquire fatigue, which represents a combination of literal fatigue as well as fear. When they reach three fatigue, they typically retire away from battle.
If a unit gets fatigue equal to either seven, or double the amount of figures in the unit, it routs off the board. It's that reason that you don't see a lot of units with only one or two figures left.
Anyway, hope you keep getting a chance to play! If you do, please keep putting up great pictures!