Here are the rules we are using:
----------------------------- Rules and Comments Follow -------------------
Limited response to action.
1. If brigade leader has no LOS to action he cannot respond unless in command control of Division leader.
2. Same for Division leader - within command range of the Corps leader.
3. Same for Corps leader - within command range of the Army leader or within 30 hexes of the corps commander whose troops are under attack AND BOTH Corps commanders must be in command control of the Army leader ...
For example:
If a brigade in the 2nd Division of Davout's III Corps is under attack then other brigades in that division that do not have an LOS may respond if they are in command control. If they are not then they may use the adjacent rule if it applies. If not then they may use the "March to the Sound of the guns" roll if so desired. If they do the die roll and obtain a result, if they come into command control on a turn before the roll would take effect then they may respond sooner. Always go with the "best" possible check result.
Just check to see if the leader is noted as "Detached."
Command Test results do not impact commanders. Thus if the leader is noted as having failed its Command Test ignore this as part of the Reaction test.
For formations in different Corps:
Both Corps commanders must be within 30 hexes of each other for brigades in their command to assist other brigades in the other corps. Adjacent brigades can always assist each other. Just because they are in LOS of each other does not mean that they can react to each other. The Corps rule is strict.
Lefebvre must be in command control of the division leader whose troops are to go to the aid of one of Davout's formations
AND
Davout must be within 30 hexes of Lefebvre.
OR
Davout and Lefebvre are in command control of Napoleon.
If a brigade has all of the above satisfied then they may react on the next turn. It is highly UNLIKELY that brigades will be able to react to action that is occurring on other sides of the battlefield.
If NOT ....
We will use an online die roller to determine if the formation that desires to go to the aid of their comrades will "March to the sound of the guns"
d10 roll:
0-4 - no response
5-7 - respond in 6 turns (one hour)
8-9 - respond in 12 turns (two hours)
Pretty simple rule. If you cant see the action happening then you cant respond. Troops do NOT block LOS for this check. Terrain does!
Thus if you stick a formation into a woods ... better keep some of its units (or leader) to where they can see what else is going on around them.
*Note:* adjacent brigades - those that have their commanders within 5 hexes of each other regardless of organization - can always go to the aid of their neighbors regardless of terrain.
------------end of rules-------
We are using this site to roll dice. Read 10 as 0.
http://roll-dice-online.com/
_________________

Generalfeldmarschall Wilhelm Prinz Peters von Dennewitz
3. Husaren-Regiment, Reserve-Kavallerie, Preußischen Armee-Korps
Honarary CO of Garde-Ulanen Regiment, Garde-Grenadier Kavallerie
NWC Founding Member
For Club Games: I prefer the Single Phase mode of play. I prefer to play with the following options
OFF:
MDF, VP4LC, NRO, MTD, CMR, PR, MIM, NDM, OMR (ver 4.07)