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Regarding your edits to Medieval II: Total War: While your interest and contribution is most certainly appreciated, I removed the section because it overlapped with information throughout the rest of the article. I originally tried to edit it, trimming the parts that were redundant, but the remainder wasn't worth keeping in a section of its own. If you don't mind, I'll include the section that you added in italics and address each part as it appears.  

 Fighting Campaign Battles   TAB 
During the campaign the player has the option of forming armies to defend their borders, wage war and destroy rebel armies that appear occasionaly. 

This is already covered under the second paragraph of the Gameplay section, specifically: ""The campaign allows the player to assume control of a faction of the time period, and build a civilization, economy and military in order to conquer other factions. Gameplay consists of controlling the faction's military, economic, and social systems via a large campaign map. During the player's turn, armies, fleets, and agents can be moved on the map. When an army engages another army, the player can choose to fight the battle personally, in the battle mode, or automatically calculate the outcome.""

Armies are formed from 'Units' normally consisted of 20-30 men for artillery, 30-40 men for cavalry and 60-70 men for infantry or archers. In adition to this a general can also recruit mercenaries for a price if need be. An army can consist of up to twenty units, or as little as one, and will move according to the units it contains. This means that an army consisting entirely of cavalry can cover a lot of ground in one turn, but would be able to cover a much shorter distance were the army to have any artillery or infantry units. 

I feel that this falls under http://en.wikipedia.org/wiki/WP:NOT#Wikipedia_is_not_an_indiscriminate_collection_of_information specifically section 4, Instruction Manuals. The specific number of people in a unit isn't significant except in the context of the game, nor are unit speed, the ability to recruit mercenaries and army size limits (since they are artificial limits established by the game designers.)

A general can be selected from amongst your family to lead the army, and he will benefit or hinder the army based on his personal traits, a General who starts fighting when he is young is more likely to develop a keen skill for combat that one who has spent most of his life governing a city. The risk is that should the army be beaten then the General may die, and even during a battle that is going in your favour your general can still get cut off, surrounded by the enemy or hit by a stray arrow. Losing a general can bring an end to a generation if he were the only son without an heir, which can affect your whole family tree for generations. An army without a general is lead by a captain, who will fight alongside whichever unit you select as the first unit in your army. A captain who performs well in battle may be promoted to General, and be adopted into your family. These generals are generally better suited to combat rather than Govenment roles.

Generals are already covered under Agents and Characters: ""In addition to their agents, each faction is ruled by a family, the male members of which act as generals in battle. Each general has a number of attributes which determine how well he governs a settlement and how well he leads an army in battle. A general's actions can affect his attributes- for example, a general who routinely kills prisoners of war may see his ""dread"" increase, making him frightening to foes; a general who prefers to release prisoners may instead increase his ""chivalry"", which makes his own troops braver.""

When two armies meet they can engage in combat, which can be either automatically resolved by the computer or fought by the the player.

Already covered at the end of the second paragraph of Gameplay: ""When an army engages another army, the player can choose to fight the battle personally, in the battle mode, or automatically calculate the outcome.""

''Armies can meet in several ways: two armies meet on an area of open ground face to face and resolve their differences, an army can wait in a wooded area and surprise a passing enemy army, an army can lay seige to a town or castle and fight the garrison for control. Training and forming a working army is an expensive and lengthly process, and traveling to fight the enemy can take even longer, so the aim of every Battle during the campaign is to kill or capture as many of the enemy as possible, while minimizing the loss to your own army, thus allowing you to carry on fighting for longer with the same army. This means knowing exactly when and where to strike