And even after they find out the war is over there is unrest. The supply of white is depleted and the Alpha Quadrant has dismantled all the facilities to make it. The Jem Hadar are in a alien system that is having interstellar strife and the Jem hadar are about to go out in blaze of berserker rage...infact some have already started.
Defiant arrives to find Jem'Hadar ships systematicly bombarding worlds commiting genocide. They have to stop them and attempt to negoiate with the remaining Jem'Hadar for a peaceful solution.