Southampton - Grimsby -

: Southampton initially intended to ban the inflatables due to stadium policy, but relented after a backlash from fans who argued the club should have "bigger fish to fry".

A central symbol of the match was the thousands of inflatable fish, known as "Harry Haddocks," brought by the traveling Grimsby supporters. Southampton - Grimsby

: More than 4,000 Grimsby fans filled the away end, creating a "sea of inflatable fish" that became the iconic image of the upset. : Southampton initially intended to ban the inflatables

The encounter between Southampton and Grimsby Town on March 1, 2023, remains one of the most storied "giant-killings" in modern FA Cup history. This fifth-round tie saw League Two underdogs Grimsby travel to St Mary’s Stadium and secure a stunning 2-1 victory over their Premier League hosts. The match is defined by several unique narrative layers: The "Harry Haddock" Invasion The encounter between Southampton and Grimsby Town on