The rules play like a combination of an updated, cleaned up DBM with an infusion of some of the elements of FoG. Each army is - in the standard game size - about 20-25 maneuver elements,. This means you only need maybe close on 40 bases of standard DBx-based troops, as Heavy and Medium Infantry types are represented by 2 standard bases locked together as a (15mm) 40x40 "DBE" base leaving LI and mounted troops as single bases. This is for the 200 point version of the game with 3 commands, which plays out in under 2 hours - you can also play a slightly larger 300 point version which will see you going to 4 commands and maybe 30-40 maneuver elements. Either way the shift to this many separate units is very DBx, and playing with this many units, where each DBE is a separate unit gives much more of a "big battle" feel than the 10-14 muli-base units in FoG.
In 25/28mm most infantry units are based on 60mm x 60mm, and the 200 point game plays extremely well with 20 or so moving units on a near standard sized table.
The core mechanics are also DBx-based, with opposed dice rolls between elements forming the core combat mechanic and pips for command and movement. Where it differs from DBx rules is that each "unit" has a number of cohesion points or hits. Heavy infantry can take 3 hits before a 4th hit removes them from play, Medium Infantry and Cavalry have 3 hit points in total, and light troops 2. Each time you lose a combat or shooting duel you suffer one or more hits - but a general can also rally units to remove hits. This sounds like a subtle difference, but it introduces a whole new dimension to troop types and how they are used comared to both DBx and FoG rules - "resilience". Heavy Infantry have greater abiilty to take punishment than Mediums, and so you can be confident that a line of Heavy Foot will take longer to grind down than a line of Medium Foot - irrespective of Armour or Troop Quality.
L'Art de la Guerre Wargaming
Troop Quality works to mitigate poor dice rolls by Superior troops, and reduce the possibility of extremely good dice rolls by poor troops - which feels logical. Armour also works in an old-school logical way, making troops with better armour harder to beat. There are a number of other common-sense post-combat effects to add flavour and variety, such as "barbarian" troops inflicting extra hits on the enemy if they win in the first round of combat, or mounted troops doing likewise when beating Medium Foot in the open. Unlike DBx games, Light troops do also shoot - which is an irritant with potential to become significant if left unopposed, rather than a game winning tactic and mechanic as it sort of became in FoG.
L'Art de la Guerre Wargaming.
I did say earlier that it is a cleaned-up DBM, and that means that even though its translated from French, there is no 'barkerese' - plenty of diagrams, and the rules, which are already V3.0, really show that they have been playtested extensively on the French competition circuit so that pretty much every niggle you can imagine has been ironed out before this edition. The author is active on the forum, and any queries usually get a direct repsonse and a quick turnaround - anything even slightly vague is included in the latest FAQ, which is also updated regularly
Internationally the rules are now well embedded in the competition community across France, Belgium, Spain The USA and with a growing following in the UK, Italy, and dabbling elsewhere such as Australia and Greece. As of today it's therefore entirely possible that ADLG is the most widely played Ancients competition ruleset in the world right now, with (as of 12/3/16) 276 players in the International Rankings as having played this year, plus another 70-odd who have played at events in the UK
I also have set up an L'Art de la Guerre Wiki which has a separate page for every ADLG army containing historical data, links to other sites, tactical tips on using the army, and all the army lists I come across for that particular list, as well (sometimes) as where to buy (15mm) figures from, a list of relevant books and collated results from competitions. This is here in The ADLG Wiki, where you can edit the pages yourself (yes, honestly!) and add stuff to it. So, you can add more detail on loads of ADLG armies, including Army Lists, Tactical Tips, 15mm figure suppliers, photos, external links, history and relevant books
l'art de la guerre (règles anglaises historiques médiéval antique, traduites en français)