I have introduces some changes to Gedemon's Mod in order to reflect the size and composition of units in Civ 5, while taking into account the way actual military units are organized in real life. In conclusion, I have changed the maximum number of units per tile of the same class to three, and I have changed the number of classes to two, where one contains Melee units, and the other contains all other support units (incl. archers, Artillery, recon, helicopter units). I also did modify other aspects of the game but those go beyond the scope of this thread.
The changes are geared towards using the same tactical military groups used in battlefields, by having a tile support up to one military division, and dealing with individual military units as combat and support brigades (of which a division has 3 to 7 in total). Below, I have summed up the analysis that I went through to investigate the way Civ 5 handles Units and how best to reflect real life battlefields in the game.
What I have noticed is that the "average" number of soldiers per unit is about 5,000 this number was the result of adding units of different types to the game (with IGE), and assessing the demographics for each combination.
5000 Soldiers is on the upper end of brigade size, where a typical brigade size is about 3000 to 5000 soldiers, western armies tend to be on the smaller side.
On the other hand, a military division which is the basic military formation capable of performing tasks on a battlefield front is composed of several brigades. "...consisting of between 10,000 and 30,000 soldiers. In most armies, a division is composed of several regiments or brigades; in turn, several divisions typically make up a corps. In most modern militaries, a
division tends to be the smallest combined arms unit capable of independent operations; this is due to its self-sustaining role as a unit with a range of combat troops and suitable combat support forces, which can be divided into various organic combinations." (Wikipedia).
I am attaching below the composition of two German and one Russian divisions during World War II, the German (1st Panzer Division, and a typical formation for their Infantry divisions), and on the other side the Russian 9th Tank Division.
It can be noted that the Germans rely on 2 combat brigades and the equivalent of one support brigade divided into anti-tank, artillary, recon, and other support battalions. The Russians on the other hand tend to deploy 3 combat brigades (Melee), and the equivalent of two support brigades.
German 1st Panzer Div.
http://en.wikipedia.org/wiki/1st_Panzer_Division_(Wehrmacht)
Russian 9th Tank Div.
http://en.wikipedia.org/wiki/9th_Tank_Division