Crowd attempts to impede police arrests at the Stonewall Inn in 1969.

A bartender who was slinging drinks at the Stonewall Inn the night it was raided 40 years ago says young people need to know how far the gay-lesbian bisexual-transsexual movement has come - and what the previous generation sacrificed to get here.

"They have no idea the older generation went to jail for them," he told the Daily News on Saturday.

Tree recalled the days of disturbance that followed the late night raid at the Stonewall Inn in Greenwich Village - which became a defining moment of the gay rights movement - as hundreds of revelers poured in and out of the Inn.

"A lot of gay people don't realize how it all started," said Hector Cruz, 38, who stopped by the bar for a drink Saturday afternoon. "This year is more exciting, I think, because of the anniversary. People are finally talking and learning about what happened."