The G'Quan never had fury help!

The battle you are talking about happened during the Narn-Centauri war. It was the first time a Centuari battlecruiser died at B5. But B5 didn't get involved in this firefight. The second time a Centuari battle cruiser died at b5 happened after the war when sheridan gave aid to a surviving narn cruiser. That is when sheridan sent the centuari start to hell, using his words.