From: Zagreb, Croatia
In manual Addendum...
v1.05.18 – September 6, 2011
New Features and Rule Changes
20) Changes to Fortification Rules
a. Requirement to build up to Fort Level 5 - Only will be built in port hexes that have a fort unit. Once built, the fort unit is not needed to keep the level 4 fort. Not possible in a swamp hex.
b. Requirement to build up to Fort Level 4 - Must have a fort unit in the hex. Once built, the fort unit is not needed to keep the level 4 fort. Not possible in swamp hex.
c. Requirement to build up to Fort Level 3 - Must be adjacent to an enemy hex, be an urban or city hex, or be in or adjacent to a fort unit. Once the level 3 is reached, the condition does not have to continue to be met to keep the level 3 fort.
d. Fort levels that have reached their maximum fort level for the hex may continue to build up to 10% towards the next fort level.
e. Building forts in mud now uses a .25 modifier (instead of .33).
f. Level 4 and 5 forts do not decay.
g. There is no fort decay on turn 1 of any scenario.
h. Doubled the rate of fort decay.
i. Increased decay rate of low level forts, based on the weather.
Extra decay percentage:
Level clear snow mud/blizzard
0 20 40 80
1 12 14 48
2 4 8 16
g. Added supply cost for fort construction as follows: fort 0->1 1 tons per fort point (no cost for isolated units, construction rate is halved) fort 1->2 2 tons per fort point (no cost for isolated units, construction rate is halved) fort 2->3 20 tons per fort points fort 3->4 200 tons per fort points fort 4->5 2000 tons
As for non-combat units causing non-decay of forts I have no idea - perhaps it is a bug... I will ask Pavel...
Prior Preparation & Planning Prevents Pathetically Poor Performance!
A & B: WitW, WitE, WbtS, GGWaW, GGWaW2-AWD, HttR, CotA, BftB, CF
P: UV, WitP, WitP-AE