Let's start with the manual:-
GameManual wrote:Sieges happen when a unit defends in a pre-war Fort, a permanent fortification, a city, a Depot or an Indian village. Two values -
one for each side - are randomly generated to resolve the siege. Various bonuses are also added and these are indicated below:
Besieging side:
•Artillery combat factors
•Leader with the “Siege Engineer” Special Ability
•Breach achieved (see below)
•Defender lacks General Supply
Besieged side:
•Artillery combat factors
•Leader with the “Engineer” or “Fort Defender” Special Ability
•Fort Level: Pre-war Forts are considered Level 1 Forts while Level 5+ trenches are Level 2 Forts
The difference between these two values, called the Siege Roll Value (SRV), indicates the result (cumulative):
•SRV > defending units’ average discipline: Defender surrenders and all units are eliminated unless the defending Force includes a Supply Wagon, in which case the result is ignored
•SRV >= 3: A breach is made. The siege icon will change to indicate a breach is in progress or achieved. Cities and pre-war Forts are breached after a single breach result while permanent Fortifications require two breach results to be fully breached.
•SRV > 0: 5 hits are inflicted on the defenders for each point of SRV
•SRV < 0: The defender has managed to repair a breach
From Dixiecrats excellent artillery analysis 2:-
Code: Select all
Table 1 Minimum Required Artillery Power
Terrain/Weather/Command Penalty
0% 5% 10% 15% 20% 25% 30% 35% 40% 45%
Siege Bonus
1 30 32 34 36 38 40 43 47 50 55
2 60 64 67 71 75 80 86 93 100 110
3 90 95 100 106 113 120 129 139 150 164
4 120 127 134 142 150 160 172 185 200 219
5 150 158 167 177 188 200 215 231 250 273
6 180 190 200 212 225 240 258 277 300 328
7 210 222 234 248 263 280 300 324 350 382
8 240 253 267 283 300 320 343 370 400 437
9 270 285 300 318 338 360 386 416 450 491Code: Select all
Power US CS
6lb 20 14
12lb 29 19
10lb 29 19
20lb 33 22
HA 31 16
Rod 37 -
Siege 42 42
Columb - 31
So your artillery siege bonus (round down any decimal fraction) = (artillery power points) * (1- command penalty) / 30
Finally we have the AGEWiki http://www.ageod.net/agewiki/Sieges_and_breaches, which I don't fully understand and seems to be mainly in terms of ROP which may or may not apply to AACW, I couldn't find if these options were in the AACW files.
If this is correct then it suggests that the dice rolls of each side may be a 15 side dice suggesting SRV = att dice (15) - def dice (15) + att bonus - def bonus
Thread here suggests bonuses don't stack http://www.ageod-forum.com/showthread.php?8500-Siege-Artillery&p=76255&viewfull=1#post76255, ie 2 siege guns will only get 1 siege ability bonus.
Leaves some unanswered questions:-
- Do the ROP mechanics on the AGEWiki Siege page apply to AACW or are they different?
- What is the fort bonuses to defender on SRV (ie for level 1 and 2)?
- Do coastal artillery guns power count for the defenders artillery bonus? If so that is why sieges of coastal forts can be drawn out, hard to breach if the coastal guns reduce the SRV.
- Where can I find the weather and terrain command penalties?
- Siege ability bonuses for guns appear not to stack, but I assume you can get a bonus for a leader ability and for siege gun ability?
- Is it only artillery power and SRV bonuses that effects the chance of a breach?
Finally whenever I have an unsuccessful assault on a fort my forces seem to retreat from the siege region, lifting the siege, is there any way to prevent this? i.e. So my forces go back to sieging the fort/city after a defeated assault?
