Army at Dawn has only 1 Sous-Lt

[plloyd1010]

So it does. If you look at the physical counters and the leader list, there is also only 1 Sous-LT. Thus I contend it is book problem, not a Vassal extension problem.

The counter mix has 2x Lieutenant and 1x Sous-Lieutenant, and there are no Lieutenants called for in the scenario. Since that fits the command structure better and the available counters, that is probably what was intended. I suggest scenario errata.