Arsenal hold a 1-0 lead at the break in their Champions League clash against Borussia Dortmund thanks to a strike from Yaya Sanogo.
The Gunners got off to the perfect start in the game in the second minute when Santi Cazorla found space inside the box, and his pass found Sanogo, who poked an effort through Roman Weidenfeller from a tight angle to notch his first goal for the club.
Sanogo should have doubled the home side's lead when he was played through on goal by Aaron Ramsey after beating the offside trap. However, the striker lost his composure in the box as he lost his footing at the vital moment.
The visitors almost got back into the game when Lukasz Piszczek raided down the right and he hit a dangerous cross to the back post for the run of Ciro Immobile, but the ball was just inches out of the striker's reach, with the goal gaping.
Dortmund pressed again when Henrikh Mkhitaryan latched on to Immobile's knockdown in the box, but Damian Martinez made a good save to turn his effort past the post.
