Arsenal eventually broke Dundalk’s resistance as goals either side of the break secured victory in their Europa League group game at Emirates Stadium.
Eddie Nketiah pounced from close range to give the Gunners the lead and Joe Willock blasted a shot into the roof of the net 125 seconds later.
Nicolas Pepe’s brilliant effort from the edge of the box seconds after the restart killed the game off.
They cruised after that but could not add a fourth against the Irish side.
Arsenal – who had never faced a side from the Republic of Ireland before – have now won both their opening Europa League games, while Dundalk have lost both of theirs.
Dundalk made a bit of history as the first team in the 10 years of the Europa League not to commit a single foul in a game.