Gillingham has taken on an almost mythical importance with blues largely because of the unbelievable drama of how we won it.
All the spurious claims that we would've sunk without a trace add fuel to the fire but had we not gone up that year we'd've gone up the next year or the next .
Biggest games in our history are for me Newcastle 68 QPR 12 and West Ham 14 - win those and we were champions, doesn't get any bigger than that. One could argue that if we get to CL final that would be the biggest game in our history as it's widely viewed as a more important competition.
Haven't read the whole thread so apologies if it's already been mentioned but I view the rags semi as right up there in terms of importance - a truly seminal moment