Ubercat wrote:How is it that some stacks start a new '61 campaign with a higher entrenchment level than is supposed to be possible at that point? I'm talking about Union cities which contain 2 stacks. One with entrenchment level 3 and the other with level 6. The 6 stacks tend to be called Fort xyz but both stacks are described as being in the city.
I'm thinking that the 6 is set at game start to a level impossible to achieve at this point, though fine when set artificially. If I could somehow move the locked stack and reduce entrenchment to 0, there would be no getting that high again until the game allows it. Do I have that right?
Probably. If a stack is inside a city and you drag it to outside, or visa-versa, it will lose of its entrenchment level. If you drag a stack onto a friendly target stack, the dragged stack will gain become part of the target stack and thus gain the target stack's entrenchment level.
Ubercat wrote:Also, is there any reason not to immediately drop the 3 stack onto the 6 to take advantage of the better defense?
Not that I know of.
Ubercat wrote:Bigger stacks will generally be more robust in a fight anyhow, right?
Generally speaking, the larger the stack is the more CP's it will require. If the target stack becomes under-commanded by adding a unit to it, the strength of the target stack will not grow equal to the strength of the dragged stack, because the strength of the entire stack will be reduced by 5% for each CP lacking. Depending on the overall strength and CP-cost, the target stack could actually lose strength.
For example, you have a fully commanded stack with a strength of 1000. You add a unit to it with strength 100 which requires 4 CP's to your fully commanded stack. The new stack now has an absolute strength 1100, but because the new stack is lacking 4 CP's it will suffer a 20% strength penalty and lose 220 in strength, reducing the entire stack to 880.
Regarding your situation with two stacks already in the region, locked I am assuming, the situation is could be far more complex depending on some factors. It all comes down to who will fight if the region is attacked.
Generally the better lead a stack is the more likely it is to fight. Unfortunately I cannot site the exact rules of how a stack or stacks is/are chosen to take part in a battle. Using the above example you would be better off leaving the 'extra' unit out of the fully-commanded stack. Were a battle to occur in the region it could very well happen that only the commanded stack takes part in the battle. However, if the 'extra' unit is also included in the battle I believe that all the units taking part in the battle will be handled as if they were in the same stack which would again penalize these defenders. But I've never actually read anything specific about this. It is my speculation.