JTS Melee Calculations

[BigDuke66]

The examples are usually more simple in the manual but a modifier is still mentioned:

"For example, given a combat value of 400, a modifier of 25%, a Low Combat
Value of 5 and a High Combat Value of 25, the effective combat value would
be 500 (= 400 + 25%).  This would be ½ of the base-line combat value of
1000.  Thus the low casualty value would be 2.5 (= 5 / 2) and the high casualty
value would be 12.5 (= 25 / 2).  The resulting casualty value would be
randomly generated between 2.5 and 12.5 for this combat.  Finally, based on
the fractional part of the casualty value, it is randomly rounded up or down.  
For example, if the casualty value was calculated to be 3.7, then 30% of the
time this is rounded down to 3 and 70% of the time is rounded up to 4."

The combat value in this case could also be a value that was already directly modified. And the noted 25% can be the overall result of smaller modifiers.