We're off again and Armagh immediately chip away at Donegal's lead with Rian O'Neill clipping over his fourth free.

There is plenty to ponder for Armagh boss Kieran McGeeney, and most of it is deeply troubling.

Donegal have dominated Armagh's kickouts and have been ruthless in attack.

McGeeney has a daunting team talk ahead of him with his side down by a dozen.

Image source, Inpho

Michael Murphy has, as usual, proved a physical focal point in the Donegal attack, but the Tir Chonaill men have been superior across the pitch during a thoroughly impressive first-half display.

Image source, Inpho

Merciless Donegal have put Armagh to the sword in Cavan as Peadar Mogan's first championship goal helps lift Declan Bonner's side to a 12-point advantage at the break.

How can Armagh haul themselves back into this one?

Image source, BBC Sport

Langan's second point of the afternoon widens the gap before Ryan McHugh adds yet another.

12 points in it now. It's turning into a procession.

Armagh win a free and Rian O'Neill ends their 24-minute barren run with his third point of the afternoon.

McGeeney tries to stop the bleeding as Niall Grimley comes on for Stephen Sheridan.

Woah.

Another measured move from Donegal leads to McGonigle kicking his second score of the day over the bar.

Donegal's movement causing all sorts of problems from Armagh as Ryan McHugh deepens the Orchard County's malaise with Donegal's ninth point before O'Donnell bags another.

Donegal utterly dominant. It looks a long way back already for Kieran McGeeney's men now.

Another mark for Donegal and Niall O'Donnell strokes it over with a minimum of fuss.

Five-point game now. Armagh still waiting for their first score from play,.

That should have been a second in quick succession for McFadden, who rushes his kick and it drifts wide.

Donegal well in control of this semi-final after 25 minutes.

Well-executed mark by Hugh McFadden, who comfortably splits the posts to nudge Donegal four ahead.

15 minutes without a score for Armagh, who are struggling to make it stick up top.

Donegal's third wide of the afternoon comes from Michael Murphy's right boot, as the ball drifts wide with the wind.

The Donegal skipper is still waiting for his first score of the day.

Just a bit of a lull after a frenetic start but Donegal move three ahead as Caolan McGonigle points from a mark just prior to the water break.

Donegal seem to have found their rhythm with Armagh dropping off a bit.

Five different scorers for Donegal.

A sustained spell of Donegal pressure does not yield the expected point as Langan fails to find his range.

Armagh are doing well to surround Murphy, but he is proving a handful early on.

Peadar Mogan produces a fine score from an acute angle to fire Donegal into a two-point lead.

Quick switch of play from Declan Bonner's men there.

Stefan Campbell shuffles into space and onto his left foot but his effort is tame and easily gathered by Shaun Patton.

Jamie Brennan has no such trouble, though, as he flies past Conor O'Neill before scoring Donegal's third point.

Ryan McHugh finds Michael Murphy with a probing pass but Armagh surround the forward and do well to turn the ball over.

Armagh flood forward and Stefan Campbell wins the free for O'Neill to pop his second point over the bar.

The tenacious James Morgan wins the free and Rian O'Neill makes no mistake to reduce the arrears.

Both teams showing plenty of attacking intent early on here.

Armagh almost find Jamie Clarke in behind the Donegal defence but the wind just takes it beyond the forward.

That could be a regular plan of attack for Armagh.

At the other end, Eoghan Ban Gallagher notches Donegal's second point.