Going in to the day all eyes were on London and thankfully, Arsenal and Borussia Dortmund did not disappoint. After both sides scored in the first half, Robert Lewandowski proved the hero with a late breakaway that secured three points for BVB.
Here's a recap of all the results from Tuesday's action across Europe:
Schalke 04 0-3 Chelsea
A brace from the newly-calibrated Fernando Torres helped lead Chelsea to an away victory over Schalke 04. Eden Hazard added a third goal late to secure the points for the Blues.
Steaua Bucuresti 1-1 FC Basel
Basel looked to be on their way to a victory after a goal from Marcelo Diaz early in the second half, but Steaua's Leandro Tatu equalized with two minutes left in full time to salvage a point for the Romanian side.
Arsenal 1-2 Borussia Dortmund
A late breakaway goal from Robert Lewandowski gave Dortmund a massive victory over Arsenal.
Marseille 1-2 Napoli
José Maria Callejón and Duvan Zapata fired Napoli into second place with a win in France. Andre Ayew scored late for the home side to make things interesting, but the Italians were able to hold on for the three points.
Austria Vienna 0-3 Atletico Madrid
Atlético Madrid kept a firm grip on the top spot in Group G thanks a goal from Raúl García and brace from Diego Costa.
Porto 0-1 Zenit St Petersburg
Porto's Hector Herrera was shown a straight red just six minutes into the match and just when it appeared they might hold on for the draw, Zenit's Alexander Kerzhakov scored after nearly 80 minutes played with a man-advantage to give the Russian the victory.
AC Milan 1-1 Barcelona
First-half goals from Robinho and Lionel Messi were all the two teams could manage at the San Siro as several great chances that were left unfinished by both squads.
Celtic 2-1 Ajax Amsterdam
A first-half penalty by James Forrest and a second-half strike from Baram Kayal led Celtic to a home victory over Ajax. Thing got a bit dicey late for Celtic when Nir Biton was sent off with two minutes left and Lasse Schöne pulled Ajax within a goal in stoppage time, but there just wasn't enough time for the comeback.