A half-dozen thugs armed with bats and knives attacked three 21-year-old Armenian men yesterday in Brooklyn, leaving a blocklong trail of blood, cops said.

The mayhem began shortly after one victim, a neighborhood resident, met two friends at 6:40 a.m. at Bedford Avenue and Avenue T in Sheepshead Bay.

The victims were taken to hospitals and are expected to survive, sources said. Cops said they suspected a dispute over money.