The Arsenal centre-back was shown a straight red card for pulling down Edin Dzeko while the visitors' skipper was also given his marching orders for a tackle on Jack Wilshere
Arsenal defender Laurent Koscielny was sent off in the ninth minute of the Premier League clash with Manchester City while Vincent Kompany was later given his marching orders but did both players deserve straight red cards?
Koscielny appeared to haul Edin Dzeko to the floor as he was about to shoot from close range and to the bemusement of Gunners fans and players alike referee Mike Dean pointed to the spot.
A red card for the Arsenal centre-back duly followed with the match official deeming that Koscielny had denied Dzeko a clear goalscoring opportunity.
The drama wasn't over there, however, as Dzeko dusted himself off and took the resulting spot kick only for Wojciech Szczesny to divert the Bosnia & Herzegovina attacker's effort onto the post and across the line before he was safely able to gather the ball and avert the danger.
It was City's turn to receive a red card later in the game as, with 15 minutes remaining, Kompany was sent off for a challenge on Gunners midfielder Jack Wilshere.
The Belgium international made contact with the ball but appeared to show both feet as he challenged Wilshere, with Dean ruling that the tackle was an act of serious foul play.
Let us know what YOU think about the key incidents in the game at the Emirates Stadium. Did Koscielny deserve to be sent off? Was it the right decision to show Kompany the red card? Let us know your thoughts in the comments section below!