A DIE-Hard Mayo fan is attempting to infiltrate enemy territory with a plan to take over Hill 16.
While it has long been considered the spiritual home of the Boys in Blue, Mayo man Ger O'Donnell, inset, has started a campaign for Mayo fans to 'Fill the Hill'.
The 21-year-old student has won the support of more than 3,300 Mayo fans who are now determined not to swap tickets and will instead wear the green and red deep in the enemy heartland.
"I was discussing the match with some mates and we were talking about what an advantage it was for Dublin having the Hill. Every year fans swap tickets on the Hill for the stands, but this year I wanted people to stand their ground," he said.
"We want them all to wear the Mayo colours, sing the songs and stick together."
Ger believes seeing the green and red of Mayo dispersed throughout Hill 16 will give the players an additional boost and help them secure victory.
"If the team are kicking into the Hill and all they see is blue, it adds to the pressure. I want them to see the green and red of Mayo there supporting them," he said.
So serious was he in his quest that the Ballina man, who plays for Ardnaree Sarsfields GAA club in Mayo, set up a Facebook page, 'Let's Fill the Hill'.
"Most of the comments I've got have been really supportive of it, but there have been a few Dubs not so happy with the plan. But it's all a bit of banter and I'm looking forward to it on the day, even if I end up there myself. I'll sing and wave flags and blow whistles and make as much noise and colour as I can.
"It's all about getting inside the head of the enemy and what better way to do that than take over their patch," added Ger.