Unit formations during the Napoleonic era were a function of linear geometry. That is to say, the shape of units was very! important at this time. And units like Regiments and Battalions were by necessity almost always configured into column shapes.
There were two reasons for this.
1) The musket was wildly inaccurate, and therefore the only way to make it useful in a combat situation was to fire it en-mass from a group of soldiers. In fact, there was no such thing as "ready, aim, fire" during this period. The order given was actually "ready, present arms, fire." Why? Because to aim at anything with this weapon was a complete waste of time, and so instead - you presented it, or in other words, simply pointed it at your enemy.
2) An amorphous mass of soldiers firing inaccurate muskets doesn't have much combat power (and would also tend to fire into their own ranks). Therefore, commanders of the time were forced to assemble their men into lines. A line, however, is not only a very unwieldy thing to maneuver around a battle field, it's also a difficult thing to retain command over and keep in order. Additionally, a line is also easily penetrated by a charging force because it lacks any depth.
Because of the above, most countries formed their units into easily commanded columns that could be quickly organized, swiftly maneuvered, and had the mass to either absorb a charge or deliver one. Britain and France were the only two notable exceptions. England, with her exceptional army discipline, was able to maintain and control a 2 deep line, something which no other country in the world would even attempt. Napoleon favored what he called the Mixed Order (Orde de Mix). This was a 5 deep line with a standard column on either side anchoring the flanks. But even these two nations would utilize the basic column formation a significant fraction of the time.
Unfortunately, NTW doesn't model this at all, and you'll commonly see countries like Spain (whose units had notoriously bad discipline) fielding entire armies in 2 deep line formations...Preposterous!
And most ridiculous of all, even if you take a column (with its' inherent huge mass and momentum) and charge one of these comical 2 deep lines, not only don't you break through the 2 deep enemy line, but you'll actually get enveloped by it!...Absurd!




