Formation is the posture that a unit takes towards its enemy. Fatigue is a measure of how tired the unit is, and is directly affected by long movements or continuous combat. Weight is a factor that affects fatigue, as the amount of armor a unit carries tires it more quickly. Leaders have a command radius that will affect how the units in that leader's command react to changes in morale. Combat weapon affects the range and damage done during melee attacks.
Missile weapon does the same for missile attacks.
The further the range from the unit, the less damage is done. Defense is the ability of the unit to defend itself during melee or missile attacks, and is dependent on the armor type, shield type, terrrain, formation, class and morale. Ammo is the amount of rounds remaining for the missile unit before it needs to be resupplied. Value is the victory point value that is tracked to determine who will win a close fought battle. Now, there is more information that is present in the game, like information on LOS, leadership modifiers, terrain modifiers, strength modifiers and the like, but for once I will skip these.