Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Two NI

Armagh need an injection of something going forward and they probably need Rory Grugan to get on the ball more.

Oisin O'Neill is having a good and shakes off his marker to bring Armagh back to within two.

Armagh win the kick-out and quickly find Ross McQuillan. There's half a goal chance on but he decides to fist over the bar.

Michael Langan clips the wrong side of the post and the ball goes wide.

No such misfortune for Peadar Mogan, though, who extends Donegal's lead to three.

Meanwhile, Armagh bring on Conor Turbitt, who was originally named to start. They need a few scores from the All-Star.

An Armagh move, allowed to happen thanks to a brilliant piece of defending from Paddy Burns to force the turnover, is finished off by Callum O'Neill.

Two-point game.

Oisin Conaty is back on his feet and will seemingly continue for Armagh.

Not what Armagh needed...Michael Murphy, in space, easy score.

Donegal strike the first blow of the second half, but Oisin Conaty - Armagh's best player so far - responds.

He goes down after scoring, though, and looks in a great deal of discomfort.

Back under way.

Donegal or Armagh? Who knows. Donegal have the edge at the moment but a lot of football still to be played.

As Conor McManus points out in the BBC studio, Armagh had an excellent third quarter in the semi-final against Tyrone.

They need something similar today.

Armagh's 2000 Ulster-winning side have just been presented on the field.

Half-time intervals seem to be getting longer and longer these days but here come Donegal so we're nearly ready to resume.

Thankfully no unsavoury flashpoint involving these two men this time.

Image source, Getty Images

Chrissy McKaigue
Former Derry captain on BBC Two NI

Donegal are very direct, but Armagh are very methodical with their gameplan. Armagh won't be happy with their lack of ball, but you feel that the two-point scores will have a big impact on this game.

Conor McManus
Two-time Ulster winner on BBC Two NI

It was a brilliant first half, Armagh roared back into it in the last five minutes. For a while you were thinking Donegal were in complete control, but Armagh finished really strong and it sets it up for a big second half.

Great first half by Oisin Gallen. He's scored four already this afternoon and is well on his way to eclipsing his six-point haul in last year's decider.

"Absolute textbook corner-forward play", says Conor McManus.

I'm inclined to listen to him.

Image source, Getty Images

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Two NI

Really good first half, both teams are showing a lot in their attack. I think the game is going to be won in the kickouts in the second half, win those and it gives you momentum.

Armagh have a wee chat in a huddle before heading down the tunnel.

Huge second half coming up for the Orchardmen, who trailed by seven at one point there.

They ended the first half with the momentum - can they carry it into the second 35 minutes?

Ohhh! Oisin O'Neill tries for another two-pointer but Shaun Patton gets a touch on its way over so it's only one point for the Crossmaglen man.

That's the final act of a frenetic enough half and it's Donegal who lead by three.

Oisin Conaty drives at Donegal and fires over.

Then Armagh, significantly, win Patton's kick-out and it results in a stunning two-pointer from Oisin O'Neill!

Big moment for Armagh!

Armagh need something and Ross McQuillan duly delivers.

But it's hard for Armagh to build anything when Oisin Gallen is in this form. He scores his fourth of the game.

Philly McMahon
Eight-time All-Ireland winner with Dublin on BBC Sport

The scores are coming from every angle; it is very hard to defend against that.

Ciaran Thompson's second two-pointer of the afternoon extends the lead to six before Michael Langan stretches it to seven.

This is a brilliant display of finishing from Donegal (apart from the two goal chances they've spurned, of course).

They're dominating Ethan Rafferty's kick-outs. Armagh's coaches have their work cut out for them at half-time.