Yeah... suppose there was the Defiant, but wasn't Dax and Worf more in charge of that? I didn't think Sisko did that much since he was mostly in charge of DS9
It's been several years since I've watched DS9 so yeah..
Was dependent, they were Commanders, and Sisko was promoted to Captain mid series, I believe when his requisition of Defiant was given.
I remember in First Contact Worf was Captain of it during the battle with Borg before he beamed over to Enterprise-E.
But when Starfleet tucked tail and left DS-9 he pretty much got the Defiant full time, if I recall the Dominion War correctly.