To remove a base in a round of shooting or close combat, a unit must suffer a number of unsaved hits equal to or greater than its 'base strength,' i.e. 4 figures per base for close order infantry, 2 figures per base for cavalry and skirmishers, etc. Sufficient numbers of unsaved hits can also cause a unit to become 'discouraged,' or require a 'cohesion' test to see if the unit flees.
So to play I would basically need a bunch of 40 x 40 bases, effectively precluding the use of figures on 25mm rounds?
The other thread linked in one of the posts above has a full discussion of this same topic.
There's some army lists available for free on the Gripping Beast website - interesting that it does seem to have a few concepts left over from WAB in terms of weapons (halberds, double-handed weapons, light and heavy armour, etc) which personally I consider unnecessary. I did notice one really silly one - English archers can be armed with 'hand-and-a-half swords', which 'count as halberds'. That's what I consider silly WAB logic - a type of soldier was known to often use a certain type of sword, which by it's definition is apparently not quite an exclusively two-handed sword, and the game has a category for two-handed weapons, and one for halberds which are apparently similar in role but not as extreme.... thus archers have 'halberds', which presumably improves their combat potential significantly.
If true, that sounds like an alarming tendency towards making some types of troops and armies excessively powerful, which was an affliction of ancient wargaming from the various WRG old-style rules to DBM and its ilk. It's also nonsense from a historical point of view, as hand-and-a-half (or 'bastard') swords were used by men-at-arms, not archers, who had cudgels and knives as their secondary weapons.
Clearly we have to give the rules the benefit of the doubt at this point
BTW, purely a guess, but D seems likely to stand for discipline, though that may be a bit too similar to cohesion to be a worthwhile distinction when there are only two categories.
I'm also wondering why another attempt to replace Warhammer Ancients is needed, when we already have Scarab Miniatures' War and Conquest, which was supposed to be a 'thinking man's WAB', or something of the sort, as well as Great Escape Games' Clash of Empires.