I tried some more experiments with my ECW Portable Wargame activation yesterday.
In the first game I gave one free activation if the commander was active, plus 1D6 per unit, requiring 3+ to get activations. I set up a scenario where a small Royalist force of two units was defensing a river-crossing, with six Parliamentarian units attacking. At some random point the Royalists would get four units of reinforcements. I thought that would give a nice test of disparate forces, for at least part of the game. Activations still had to be done from either left to right or right to left, with units furthest from the baseline acting if there was more than one unit in the particular file.
Both sides had three regiments of foot, two of horse and one of dragoons, all classed as trained.
Here are the Royalist defenders; a regiment of foot and one of horse.