Seventh-tier Plymouth Parkway came from behind to beat fellow Southern League Premier South side Berkhamsted 2-1 and reach the second round of the FA Cup for the first time in their history.
The first chance of the game fell to Berkhamsted through a corner as Jeanmal Prosper met a perfect delivery to head at goal, only to be denied by Ryan Brett, who stood firm on the goal line to clear the danger.
Parkway then had their own opportunity to open the scoring when Rocky Neal played a sublime flick in to the box for Reece Thomson to control and fire towards the top right corner, but his effort sailed just over the crossbar.
Luke Andrews thought he had put the visitors ahead on the half-hour mark when he was played through on goal to calmly beat Aaron Dearing, but the offside flag went up to deny him.
Following a goalless first-half, Berkhamsted put themselves in front moments after the restart. The breakthrough moment came as Jonathan Lacey slipped Andrews in down the left side of the box for the number 10 to fire a low effort in off the foot of the far post.
Thomson went agonisingly close to levelling for Parkway just minutes later when he beat the Comrades' defence with neat footwork on the edge of the box before unleashing an effort that rattled the left post and bounced away from danger.