Thanks, that is what I was thinking. The term "unit" makes it easier to envisage, classing 3 or 4 single based figures as a platoon sized "unit" gives 12-16 figures for imperial companies which seems about right for a skirmish game and then 24-32 for tribals/natives.
I have ordered a copy of the rules so am looking forward to trying to work out some forces at this lower scale.