¶ Corps
Corps is a few 
armies on different hexes that maneuver simultaneously and / or participate in one 
battle. The number of armies united is called the corps size.
Corps size limit is the maximum number of armies that can form a corps.
By default, it is equal to 1. For each castle you build, raise your corps size limit by 1. Therefore, the maximum corps size is 4.
Armies (1), (2), and (3) form one corps that attacks the garrisoned city (4).
¶ Corps Properties
Corps strength of the corps is calculated during each battle. It is the number of attack / defense 
added to the 
battle bag in preparation stage:
- +n for strength of each army of this corps
- +n for strength bonus of one chosen army of this corps.
Corps strength bonus is taken into account if the conditions of the corresponding technologies are met.
Corps courage is calculated as the sum of courage of each of its armies. In this case, courage modifiers of every army are added.