"Well, blessed are the peacemakers, especially the fighting peacemakers!" goes a line from Melville's "Billy Budd." That could have been the epigraph to the powerhouse fight film, "Warrior," starring Joel Edgerton as a high school physics teacher -- a husband and father with a foreclosure breathing down his neck -- and Tom Hardy as a 14-year Marine vet returning to the States after hard times in Iraq. These long-estranged brothers set out to win a mixed martial arts championship in order to preserve or regain their self-respect and solvency. We see, early on, what they don't. Their integrity really depends on connecting with each other in every sense of the word.