As seen in the pilot episode "Emissary", Sisko harbored a deep resentment towards Captain Jean-Luc Picard for years because it was Picard, as Locutus of Borg, who led the Borg attack against the Federation at the Battle of Wolf 359. Sisko lost his wife, Jennifer, during the Borg attack, forcing Sisko to raise their young son, Jake, as a single parent. To take care of Jake, Sisko placed his Starfleet career on hold by taking up a backwater position at the Federation Utopia Planitia shipyard orbiting Mars.