Taking the side of the South Boston Allied War Veterans Council, a federal judge has ruled that Sunday’s parade will traverse the traditional route rather than the shorter version that was used last year in a very much snow-bound Boston.

Mayor Martin Walsh and Boston Police Commissioner William Evans had decided to keep the abridged route this year, citing cost and safety, a move the veterans contested in federal court.

On Tuesday, US District Judge Richard G. Stearns found in their favor on First Amendment grounds, according to the Boston Globe, calling the parade “a matter of constitutional protection.”

The parade is scheduled to start at 1 p.m., working east from West Broadway near Broadway Station deep into Southie, moving along East Broadway, turning south on P Street, reversing course, then heading past Thomas Park and down Dorchester Street to Andrew Station. Last year’s parade halted at Farragut Road.

The agenda for Sunday also includes the annual St. Patrick’s Day breakfast at the convention center at 10 a.m. “The snow no doubt helped in terms of the material last year,” said state Sen. Linda Dorcena Forry, who will host the breakfast for the third consecutive year. “There’s still a lot that we can talk about, whether it the T situation, or the parade, obviously. The Evacuation Day parade.”

Top state officials like Gov. Charlie Baker and Mayor Martin Walsh are scheduled to attend once again. Vice President Joe Biden’s made an awkward call-in last year, but “no one is calling in” this year, said Forry. “Hopefully we’ll be able to get someone as a special guest.”

The senator noted that the legal fight in which parade organizers defeated the city offers some fresh material for speakers to play with.

NECN will live-stream the breakfast and the parade.