ROTD Combat Strength Modifiers

A unit's basic combat value is its strength, modified as follows:
 
Combat Arm:  
Arm Modifier
Infantry None
Cavalry x0.6
Horse Artillery x6
Light Artillery x9
Siege Artillery
x6 in field combat
x24 in bombard
Militia x0.75 in a city/town square, else x0.5
Naval Batteries
x3

In general, the strength of a brigade is equal to its manpower as modified by the above chart. A cavalry or infantry brigade with a battery attached has 100 of its men modified as artillerists and the rest of its strength modified by the brigade type. Artillery attached to infantry brigades is field artillery; artillery attached to cavalry brigades is horse. Artillery brigades must have at least 50 men to fire one battery. Artillery brigades with fewer than 50 men fight as poorly armed infantry and are modified as x0.5. Artillery brigades can use up to 100 men per battery. Artillery brigades with more than 100 men per battery have 100 men for each battery modified as artillerists and the rest modified as x0.5. All other artillery brigades have strength equal to their manpower as modified by the above chart.


Weapons

Units with upgraded weapons (rifles for infantry and artillery, breechloaders for cavalry) get a bonus: +10% for infantry, +20% for artillery, +10% for cavalry unless no enemy infantry is engaged, in which case +25%. Batteries attached to IN and CV units get the bonus for artillery applied to 100 men; the rest of the brigade gets the infantry or cavalry bonus. IN batteries are LA, CV batteries are HA.



Combat Attitude:  
Attitude Strength modifier Casualty modifier
Assault/last-ditch +10% +10%
Attack/defend 0 0
Skirmish -50% -50%
Evade -90% -80%


Tactical Square Defensive Rating:  
Defensive rating Defender's modification
0 -10%
1 0
2 +10%
3 +20%
4 +30%


Fortification Rating
Fortification level
(directions facing attack only)
Attacking unit's
strength modification
1
-33%
2
-50%
3
-60%
4
-67%
5
-71%

Fortifications protect against attacks in the direction they face, and one adjacent direction to either side. A fortification facing north protects against attacks from NE, N, and NW; a fortification facing southeast protects against attacks from E, SE, and S.


Communications:
Out of communications: -20%
Unit Quality:  
Quality Modifier
Excellent +30%
Very Good +20%
Good +10%
Average
0
Fair -10%
Poor -20%
Very Poor
-30%


Unit Experience:

Bonus = square root(experience)/10 + 0.6
Example values:
Exp Modifier Exp Modifier Exp Modifier
0 -40% 9
-10%
36
+20%
1 -30% 16
0
49
+30%
4 -20%
25
+10%
64
+40%


Unit Morale:
Bonus is equal to (unit morale-50)/3. For example: morale of 50 gives no change, morale of 80 gives 10% bonus, morale of 20 gives 10% penalty.


Terrain:  
Terrain Modifier
Hills/high hills Artillery +25%, cavalry -33%
Mountain pass Artillery +25%, cavalry -33%
Forest Cavalry -20%, infantry -20%,
horse artillery -33%, other artillery -50%
City/town Artillery -20%, militia +50%

Attached batteries count as artillery for the purpose of terrain modifiers.

Battle Line Modifiers:
  Firing Phase Melee Phase
Front Line Artillery: -33%
Artillery: -67%
Second Line Infantry: Does not fire
Cavalry: Does not fire
Infantry: +10%
Cavalry: +10%
Rear Line All branches: Does not fire All branches: -50%

Battle line modifiers are applied to the brigade as a whole - attached batteries get the IN/CV modifier, not the artillery modifier. Battle line modifiers do not apply to bombardment.



Flanks Turned:

In firing phase, units which have turned the enemy's flank gain 20% per flank turned
In melee phase, units whose flanks have been turned lose 20% per flank turned



Other Modifiers:

Tactical movement during the same tactical phase as the battle: siege artillery -75%, other artillery -20%, infantry -20%, cavalry -20%, militia -33%. Attached batteries are artillery for this modifier. Moving in forest terrain adds an additional -20% to all branches.

Climbing hill into battle: -20%

Fatigue: If fatigue>6, x6/fatigue level

Out of ammunition: infantry and cavalry -50%, artillery -90%, attached batteries count as artillery

Friendly artillery firing: +10% for infantry and cavalry


Modifiers that affect the strength of all units on one side (flanks turned, line length adjustments) are applied only after all modifiers that affect the strength of individual units have been applied and totaled for that side.
Last modified 4/26/18