St Austell, of the South West Peninsular League, became only the second Cornish team ever to reach the semi-finals of the FA Vase as they defeated Ascot United at Poltair Park.
A crowd of 1,443 witnessed the Lilywhites overturn a half-time deficit of 2-1 to win 3-2 and progress through to the last four of the competition.
The hosts took the lead on eight minutes through Martin Giles before a brace from Daryl McLean saw the visitors edge ahead.
However, the Lilywhites showed real bouncebackability as second half efforts from Neil Slateford and Liam Eddy saw St Austell run out as 3-2 winners.
They have now become the first Cornish side to reach this stage of the FA Vase since Truro City did in 2007, before going on to beat AFC Totton in the final.
The semi-finals take place on March 21st and 28th.
