Here's the setup. To the right are the Royalists, under Prince Rupert. All of their troops are on-table; some horse along the baseline, and two units of horse in the fields near the bridge.
To the left are the Parliamentarians; two units of horse and some dragoons, moving down the road and crossing the bridge. The two sides have just spotted each other, so every on-table unit is surprised.
Off table to the left are five more units of Parliamentarian horse, which will appear on a score of 5 or more from the second turn onwards.
The varying number of activations worked fine, and there was some moving and replacement of commanders to use up actions as well. All in all a quick and fun game.