More than one corps battle

[Hobbes]

Hi folks, I just had 4 corps move into a region on synch move yet only one of
them were involved in the battle that followed. Can anyone shed any light on what influences the chance of corps not making it into battle when they are
in the same region? Terrain, weather, leadership, random?
What if one corps is on aggressive and another on defensive?

Thanks, Chris

[Hobbes]

The next turn sees all corps (still on synch move) enter battle and win yet
at the end of the turn the army HQ has moved on to the next plotted region
but the other corps did not (although they are plotted to). The army HQ is now exposed in a region on it's own.

Is there a reason for this?
Chris

EDIT: It seems that the timing problem happened the turn before with some
Corps on synch move moving more quickly than others. Should they not all move at the speed of the slowest Corps?

One other little problem I found in this turn is that a stack with "enter structure" orders do not enter the structure if they arrive on the last day of the turn. I thought this had been fixed in BoA?

[Montbrun]

The synch mechanism could use some looking at. An example would be if you created a Cavalry Corps (ie Stuart), that corps should also be subject to the synch. I think the "delay" switch also has something to do with this....

[Pocus]

there are some cases where the Army HQ is moving before others units, for now the exact problem has not been exactly pinpointed alas.

As for multiple corps engaging (or not) in a region, it depends of the strategic rating of each corps commander, if he is activated or not, if he has a command penalty, and what is the speed of the corps (full cav corps react faster). Also you can have a screening effect, ie if you have a corps in offensive against another in offensive, unless your first corps is overwhelmed, a second corps of you in defensive won't intervene. This is on purpose.