Bill you are lucky you can play with more units without waiting
in this menu press historical battles, it will lead you crowded ones:

Quote:
III- Historical scenarios
Napoleon's Eagles deals with the historical engagements of the Napoleonic era. It represents the true ‘grognard’ companion to the NTW3 classic mod. The battles are carefully researched and recreated with detailed OOBs, uniforms, and historical behavior.
Maps were created from 1:25000 scale topographical data, villages represented with their correct layout and stronghold positions. Realistic terrain effects impact heavily on the unit movement and behavior. Historical battles play in a more realistic fashion, they are slower and fatigue settings are harder.
It would be best to familiarize yourselves with the historical battles prior to playing them. In the final release, the orders of battles, the map analysis and other features (victory conditions, starting positions, delays etc...) will be published to allow an offline study of these battles.
These battles are meant to be played in MP, playing them on LAN with AI will cause significant lag on some PCs while the AI tries to manage a huge number of units.
Version 1 offers:
Battles from Napoleon’s 2nd Italian campaign: Marengo and Montebello.
Here the numerous Austrian army of FM Melas will face the more mobile divisions of the Reserve Army of Napoleon.
The first volume of the 1806 campaign: Auerstädt
The epic struggle between Prussia and the French "decima legio" of marshal Davout's III Corps. Recreated with a wonderful autumn map, the Prussian player(s) field more than 90 units in the full scenario.
The Battle of Austerlitz, or the battle of the THREE EMPERORS.
Here you will try to recreate Napoleon's most impressive military victory or try to restore virtual dignity to the Austro-Russian coalition. Who knows, if you do well Prussia might throw her lot with you and declare war on the French empire.
The battle of Waterloo.
Probably the most famous of the Napoleonic battles. You will get to recreate the fight for Hougoumont, the attack of D'Erlon's corps, the charge of the Middle Guard...Will you change history and beat Wellington before Blucher arrives? Or will you still be driven to abdicate?
Other included battles: Aspern-Essling, Hohenlinden and Eylau.
Unique to Napoleon’s Eagles is the ability to control an entire army.
This would mean, playing Marengo on a 1vs1 basis will offer each player the challenge to manage more than 80 units, playing the same battle on 2vs2 will give players 40 units each on so on.
To access these wonderful engagements please use the scenario battles instead of land battles when hosting. You will have the opportunity to pick how many players will be on each side from there. Please note that sometimes the players will see very few units available to them in the pre-loading screen but in fact they will have an appropriate army in game.
Quatre Bras and Jena coming with version2 as well soon. This is NTW3 Historical Battles steam group -
http://steamcommunity.com/groups/ntw3_hb but before you do that please try 20 slot lobby MP games, i am sure you will like them too.
The path my game is installed is this(i use vista):
"C:\Users\username\AppData\Roaming\The Creative Assembly\Napoleon"