The Defiant heads to AR-558, a former Dominion communications array now under Federation control. The array, however, isn't giving ups its secrets too easily and all attempts to link up with the array have proven fruitless. With subspace mines set up around the asteroid and Jem'Hadar soldiers continuing to lay siege to the rock, coupled with Federation forces that have been holding the array for five months, the Defiant crew find a demoralized force in place. When the Jem'Hadar attack yet again, Sisko elects to stay behind with his team in order to hold the ground.
When the Cardassian occupation of Bajor ended in 2369, the mining space station Terok Nor was left abandoned, its systems ripped out. By invitation of the Bajoran provisional government, Starfleet stepped in to oversee the rebuilding and day-to-day operations of the newly christened Deep Space Nine.
The years of Starfleet's nonintervention into Cardassian matters, however, had taken its toll on relations with the Bajorans. Consequently, Starfleet's position was a tenuous one; many Bajorans, suspicious and hostile as a result of decades of Cardassian oppression and brutality, did not greet the Federation's presence with open arms. The Federation's assistance is put to the test as DS9 becomes a center of travel and commerce that stretches into the Gamma Quadrant.