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1997-10-11
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Age of Rifles FAQ #7
Unit Frontage and Fire Strengths.
First a few definitions...
Formation frontage places limits on the proportion of a
unit's weapons that can be brought to bear, based upon the geometry
of particular formations.
Formation frontage (ff):
formation ff
defensive order available troops
line available troops
supported line available troops/2
attack column available troops/4
square available troops/2
other available troops/8
skirmishing skirmisher frontage
Parade ground frontage (pgf) and skirmisher frontage (sf)
vary with the scenario scale:
scale pgf sf
100 y 250 troops 100 troops
200 y 500 troops 200 troops
400 y 1000 troops 400 troops
Parade ground frontage is the absolute maximum number of
troops that are free to fire their weapons in any particular direction
(actually an arc). The number is based upon a rather generous
assumption that densely packed troops deployed in two lines can direct
as many as 5 rifles out of a 2 yard span.
Skirmisher frontage is similar, but applies to units with
skirmishers deployed regardless of formation. Reflecting increased
spacing of skirmishing troops, the number is based upon an
assumption that troops scattered in a loose skirmish "line" can direct
only one rifle out of a 1 yard span. Skirmishers are assumed to be
deployed in front of any other troops in the unit, so they block fire
from any troops behind them.
Additionally, dismounted cavalry (any unit with mounts, but
not equipped with crew served weapons) have their frontage reduced
by 20% - the number of troops assumed to be watching mounts.
If a unit shares a hex with another unit, these numbers are
halved, effectively dividing available frontage up between the two
units in the hex.
The actual number of troops who can fire their weapons is the
lesser of formation frontage or parade ground frontage.
Naval units are not subject to frontage calculations when
determining fire strengths.
Examples: (based on 200 yard scale)
An infantry unit with 700 troops, deployed in line:
Skirmishers not deployed:lesser of (700) or (500) = 500 may fire.
Skirmishers deployed: 200 may fire.
The same infantry unit with 700 troops, deployed in supported line:
Skirmishers not deployed:lesser of (700/2) or (500) = 350 may fire.
Skirmishers deployed: 200 may fire.
A cavalry unit with 600 troops, deployed in attack column:
Skirmishers not deployed:lesser of (600/4)x0.8 or (500) = 120 may
fire.
Skirmishers deployed: 200 may fire.
A disordered infantry unit with 900 troops:
Lesser of (900/8) or (500) = 112 may fire.
An artillery unit with 400 troops, unlimbered (line formation), sharing
a hex with another unit:
Lesser of (400) or (250) = 250 may fire. The number of crew served
weapons that can fire is limited by the troops allowed to fire. If this
unit were armed with 6 x 24 pounder ML howitzers (crew=20) all
guns could fire.
Note that in most cases, the number of troops allowed to fire
will be limited by skirmisher frontage if skirmishers are deployed,
regardless of formation.
Now the formulae...
melee strength=lesser of (pgf or available troops) * unit
capability * formation modifier * special modifiers. The formation
modifier varies from 1.0 (defensive order) to 0.20 (march column).
Special modifiers include things like mount status, terrain modifiers,
etc.
fire strength=lesser of (pgf or ff) * unit capability * special
modifiers * weapon lethality at range / crewmen required to operate
the weapon. Special modifiers include things like lighting and
precipitation, mount status, etc. Note that this formula effectively
limits the number of crewed weapons that can fire by assigning
available frontage based upon the crew size required to operate the
weapon. A weapon with a crew of 30 would require the same available
frontage as 30 rifles.
The long versions of these formulae go on for several pages.
Norm Koger 2.0
November 2nd, 1996.