 Some sources indicate that the real Slaughter spent more time playing poker than he did raising cattle or in the pursuit of the lawless element.Dedicated to the game of chance, he frequently beat the cattle king John Chisum at cards.In 1876, Slaughter was playing poker in San Antonio with cattle rustler Barney Gallagher and several other men when Slaughter noticed that Gallagher had marked cards and appeared ready to claim the pot.