Copy/Pasting this from another thread where I complained about it but was ignored:
tldr: Column Rolling is the way combat was resolved in Classic. You roll your "1"s first, then opponent assigns casualties. After casualties are assigned, you roll your "2"s, and so on. Normally, you’re supposed to roll all of your dice before your opponent assigns their casualties.
Longer Explanation including the reason why this should not be a thing:
As long as we’re talking about the combat phase, I just remembered a gripe I’ve been meaning to bring up for a while now:
Why is Column “Lane” Rolling ( where, during combat, you roll the dice for each column and assign hits in-sequence, rather than rolling all dice before assigning hits . Ex. If attacking with 3 INF/1 TANK, I would roll my INF dice for “1s”, then my opponent would take hits as needed, then I would roll for my TANK) in-place in this game? I thought Column Rolling literally only existed in Classic 2nd Edition (maybe 3rd too, I don’t remember completely).
I bring it up because, although it really hasn’t impacted any of my games yet due to the whole “asynchronous play” thing. I can see it being an issue when you’re attacking another territory and are squaring off against a large number of enemy units that have a diverse range of combat stats. Something like:
I attack with 2 SUBs, 1 DD, 1 CV, 2 FTR
Opponent defends with 3 SUBs, 1 CV, 1 FTR
I do my roles, blah blah.
Opponent rolls for the subs, miraculously gets 3 hits.
Because of the way AAO works (column rolling), I need to pick who dies to the subs before the opponent rolls for the CV and FTRs.
This creates a tough situation for me. Do I lose the SUBs and DD, hoping that the CV and FTR won’t kill my carrier, do I lose 1 SUB/1 DD/1 CV to try to keep my Submarine alive, assuming at least one more hit (which would be assigned to a FTR), or do I lose 2 SUB/1 CV to allow my FTRs to get off one more round of hits, ensuring that the enemy navy is sunk even if it means sacrificing the FTRs (assuming they can’t NCM to safety).
In a normal game, a conundrum like this would not occur, as the defender would roll all of their dice before I assign casualties. Column Rolling adds a level of strategic depth/risk-taking to the game for sure, but it’s not a 1:1 recreation of the rules of 42SE.