[Moonman62]

From Wiki:

The attack on the Death Star in the climax of the film Star Wars is a deliberate and acknowledged homage to the climactic sequence of The Dam Busters. In the former film, rebel pilots have to fly through a trench while evading enemy fire and fire a proton torpedo at a precise distance from the target to destroy the entire base with a single explosion; if one run fails, another run must be made by a different pilot. In addition to the similarity of the scenes, some of the dialogue is nearly identical. Star Wars also ends with an Elgarian-style march, like The Dam Busters.

[Riley]

Happen to have a copy of The Dam Busters sitting right next to me. Did you ever see the Carling Black Label ad that’s a send-up of The Dam Busters?

https://www.youtube.com/watch?v=yCmhR2JK1VE

[PAR35]

See also the sequential attack runs up the fjord in 633 Squadron.

[grobdriver]

a deliberate and acknowledged homage to the climactic sequence of The Dam Busters

I rather think it resembles the attack sequences in 633 Squadron.

British Mosquitoes attacking a fuel factory by bombing the overhanging cliff, and their only approach was through a fiord, at wave height (in order for the bombs to undercut the cliff), taking flak from the defending Germans.

Dam Busters had a semi-similar attack sequence, but without the "trench/fiord" aspect and the defenders were only at the objective; there was no gauntlet to get through.

[SkyPilot]

Lucas ripped off The Dambusters and other films in Star Wars. He also lied about having the entire trilogy written before the first film was made. All the garbage about Lucas having the plan all along that Vader was Luke's father is pure bunk. Oh well, he is a Billionaire.