The Units Manual for Age of Kings and The Conquerors with Unique Units graphics.
The Manual is designed as a reference for newer players, giving basic descriptions of strengths and weaknesse of each unit, and how best to employ it in battle; as well as providing the unit's statistics and a picture of it.
The file is a .pdf for Adobe Acrobat Reader. If you do not have this program, check your Age of Kings CD, and install it.