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"Call to Arms" is the 26th and final episode of the fifth season of Star Trek: Deep Space Nine.
Commander Sisko and Miles O'Brien move to one of the Promenade windows where a large crowd has gathered. O'Brien states that "maybe they're not coming", to which Sisko replies "that would be a nice surprise". Suddenly, the wormhole opens and several dozen Dominion starships enter the Alpha Quadrant on their way to Cardassian space. This is the fifth Dominion convoy to enter the Alpha Quadrant in as many weeks. Sisko predicts that an attack will occur soon.
Later, in the wardroom Sisko reveals that the Romulans have signed a non-aggression pact with the Dominion, joining the Tholians and the Miradorn who have already done so. The Bajorans are still debating the pact as they were also recently offered it, but Kira assures everyone that they will never sign it or any form of agreement with the Dominion. Sisko also reveals that Starfleet Command has decided no more Dominion ships can be allowed into the Alpha Quadrant. A minefield will be deployed at the mouth of the wormhole to stop the Dominion convoys. Odo comments that by doing so they could start a war, to which Sisko replies that "Maybe so. But one thing's for certain: we're losing the peace, which means a war could be our only hope..."