This mod is a effort to make Age of Empire 2: The Conquerors a historical battles game. To make this possible there are new game mechanics mentioned below:

1) There are 3 types of population:
a) The house population (vanilla population), used for villagers, siege equipment, ships and retinue units.
b) Mercenary population, the population used to train unique soldiers. It is increased by building camps (Noble Camp Tent / Camp Tent)
c) Knight population. The population used to promote knights, it can be increased by building castles or towers.

2) The total Blacksmith research armor are 27, to train new more powerful soldiers you need to research their armor first.

3) Units Change. The units are slower and has less LOS, their rate of fire is based on real weapon reloading time, like bow, crossbow, hand cannon etc. On the other hand, ships are more powerful but will cost more and can train less (about 4 times less than normal). The unique units now are train in Noble Camp Tent (it will be build by deleting Noble Caravan Camp), and will cost only gold.

4) The total number of unit types has been increased to 44 land soldier (not including unique units) and the tech tree made in that way that every unit will not change the weapon they use, like jumping from bow to crossbow, spear to pike etc. The same is with the naval units, they have been increased by 4 warships, but the 2 demolition ships has been taken out. Researching the unit upgrade will not turn your current units into the upgraded one, but will just allow you to recruit the new types.

5) New way to collect resource. Not just farms, but you can now pay to have pastures for sheep and later cattle. In the other hand, Town Center is more important because there are no lumber camp or mines. This make harder to collect villager in late games, but don't worry there is a new type a villager, a Cart Villager.

There are more other changes that you can figure them out playing.

Mod Guide