I had time yesterday morning to think about that list and started to get some interesting ideas. Then I spent a tense 4 hours as a Roman defending a hill line against a horde of hairy Gauls, (something for my Gathering of Hosts blog). By the time they retired discouraged, I could barely remember my thoughts of the morning!
The main thing which I have been trying to come to terms with, which is different from earlier and later wars, is the historical attempt to deal with magazine rifle and machine gun fire by attacking with infantry extended in long thin lines with wide spacing by advancing in groups alternately making short leapfrog rushes or providing covering fire. Under heavy fire such lines could stall but with both sides taking cover, a desultory firefight could go on for hours. If a unit did manage to get close enough, a final rush could carry the position ........ or get shot to pieces.
In theory the old wrg system of rolling to hit then rolling again to convert a pin to a kill should work but its a lot of rolling and when no one is moving the odds should be tediously low. I did consider having all units in the field of fire of an enemy to always be pinned and just roll to see if it managed to work forward and if it lost any figures but it just didn't feel right, especially with glossy toys.
Turning back to my existing mechanisms I decided to tweak something I experimented with a few weeks ago by treating a fire swept area as a sort of terrain effect. I looked at forms of reaction fire but the existing igo system with fire or move will work well enough.b
The idea is that an extended unit may only move 1/2 if it is in the line of fire and range of a deployed enemy unit. If a unit moves and then takes hits it must roll higher than the number of hits (+1 for elite etc) otherwise it falls back to where it was and may not try again next turn.
Troops in column seemed to have been harder to stop but took horrendous casualties so they will suffer heavier, pissibly double casualties but do not have to test due to fire.
Stationary troops will not need to test either. The only way to get them out will be to shoot them all or assault them. (Assuming as usual that wargame hits are not all dead and wounded.)
Hopefully a new test game will happen on Friday.