Rom had an ear infection, Quark wouldn’t give him time off so he formed a union and eventually quit to go work on the station’s maintenance team.

As a result, he was involved when O’Brien and Dax were trying to come up with a way to block the Dominion’s reinforcements from coming through the wormhole and came up with the idea for cloaked, self-replicating mines.

Then he sabotaged the station’s weapons so they could offer no resistance when the Federation arrived to retake the station.

Rom turned the tide of the war drastically.

Shamefully stolen from: https://www.reddit.com/r/startrekmemes/comments/1cy3kmh/imagine_showing_this_to_someone_whos_never_seen/