Columns: No. | Title | Directed by | Written by | Original air date | Production code | U.S. viewers (million)
1 | "Pilot" | Charles McDougall | Shawn Ryan | February7,2011 | 1ATA79 | 9.43 | 2 | "Hog Butcher" | Clark Johnson | Patrick Massett & John Zinman | February14,2011 | 1ATA01 | 7.35 | 3 | "Gillis, Chase & Babyface" | Guy Ferland | Davey Holmes | February21,2011 | 1ATA09 | 7.87 | 4 | "Cabrini-Green" | Jean de Segonzac | Tim Minear & Jon Worley | February28,2011 | 1ATA10 | 8.04 | 5 | "O'Leary's Cow" | Clark Johnson | Kevin Townsley | March7,2011 | 1ATA03 | 7.46 | 6 | "The Gold Coin Kid" | Lesli Linka Glatter | Heather Mitchell | March14,2011 | 1ATA02 | 7.30 | 7 | "Black Hand and the Shotgun Man" | Billy Gierhart | Davey Holmes | March21,2011 | 1ATA04 | 6.16 | 8 | "Wild Onions" | Adam Arkin | Virgil Williams | April11,2011 | 1ATA05 | 5.94 | 9 | "St. Valentine's Day Massacre" | Michael Offer | Christal Henry | April18,2011 | 1ATA06 | 6.38 | 10 | "Bathhouse & Hinky Dink" | Terrence O'Hara | Patrick Massett & John Zinman | May2,2011 | 1ATA07 | 5.60 | 11 | "Black Sox" | Michael Offer | Heather Mitchell & Kevin Townsley | May9,2011 | 1ATA08 | 5.67 | 12 | "Greylord & Gambat" | Paris Barclay | Virgil Williams | May16,2011 | 1ATA11 | 5.86