Fortress is the fourth studio album by American rock band Alter Bridge, released by Roadrunner Records on September 25, 2013. Michael Baskette, who produced Alter Bridge's previous two albums, Blackbird (2007) and AB III (2010), returned as the producer. It is their only album since their debut, One Day Remains, not to be released in October. The lead single, "Addicted to Pain", was released on August 12, 2013. The album was widely acclaimed, with several critics calling it the band's best album to date and giving praise to each of the band members' musical skills displayed on the record.