Arsenal finally ended their barren run of form against Premier League champions Chelsea with an impressive 3-1 victory at the Emirates.

So often have the Blues tormented their London rivals in recent season but Carlo Ancelotti's men were pegged back for the most part in an evening where the Gunners turned their possession into goals.

Alex Song broke the deadlock just before half-time, stroking home from inside the area to give the home side the lead at the break.

Arsene Wenger sent his troops out firing as the excellent Theo Walcott picked out Cesc Fabregas to sweep home the second six minutes after the restart, and the captain returned the favour to send Walcott through to finish emphatically for the third.

Branislav Ivanovic headed a consolation and while there was a momentary period of pressure, Chelsea limped to yet another defeat to leave them with six points from their last eight league games - the club's worst run since 1998.

Arsenal, beaten at Manchester United in their previous game, were positive during the opening exchanges.

Robin van Persie almost collected Song's chip into the box, but the ball bounced just ahead of the Dutch striker.

Warning

There was a warning with Chelsea's first meaningful attack as Didier Drogba - with 13 goals in as many games against the Gunners - shrugged off his marker to drag a 20-yard shot wide.

John Terry pulled back Van Persie as the Gunners looked to break on the half-way line, but a stern talking-to from referee Mark Clattenburg was all the Chelsea skipper received.

The home side continued to press, and had a penalty appeal waved away when Florent Malouda looked to have made some contact with Van Persie at the edge of the box.

Samir Nasri's 25-yard free-kick was on target, but held by Petr Cech.

Walcott latched on to a long ball over the Chelsea defence, but just as he aimed to cut back into the area, his touch was poor and Terry recovered to clear.

On 29 minutes, former Gunner Ashley Cole went into the referee's book for tripping Walcott as his England colleague turned him on the right touchline.

Van Persie was then put through into the left by Nasri after some clever one-touch passing, the Dutchman snatched at his angled shot, which flew high and wide.

Salomon Kalou was perhaps fortunate to receive only a yellow card after jumping in, studs up on Gael Clichy.

Arsenal increased the tempo as half-time approached. Walcott scampered into the right side of the Chelsea penalty area and was blocked by Cech at the near post before the goalkeeper turned over Nasri's chip which was looping into the top-left corner.

The Gunners finally made the breakthrough after 43 minutes. Jack Wilshere and Song exchanged passes on the edge of the area, with the Cameroon midfielder carrying the ball into the box.

Paulo Ferreira slid in and tripped Fabregas, but Song had the presence of mind not to wait for a whistle and swept a low left-footed shot across goal and into the bottom right corner.

Chelsea made a change at the start of the second half as the creative Brazilian Ramires replaced John Obi Mikel.

Arsenal, though, had a two-goal cushion after 51 minutes. Van Persie held the ball up 30 yards out, and, as he was closed down, Michael Essien's challenge inadvertently pushed the ball straight to Walcott clean through on goal.

The England winger dashed to the edge of the box, where he drew Cech before sliding the ball along to Fabregas and the Arsenal skipper made no mistake from 15 yards.

Chelsea had little chance to recover, as Walcott smashed in goal number three just 90 seconds later.

Walcott robbed Malouda and fed Fabregas, who repaid the favour by sending the Arsenal winger away down the right for him to slot a low shot into the bottom left corner.

Ancelotti had to do something, and sent on Gael Kakuta, replacing Malouda. Chelsea snatched a lifeline after 57 minutes when Drogba's free-kick floated through to the six-yard box, where it was nodded in by Ivanovic.

Record

Given Arsenal's recent record of failing to hold on to winning positions, the visitors rallied. Chelsea made a final change when Ferreira was replaced by Jose Bosingwa.

Arsenal just about weathered the storm as the contest entered the final 20 minutes.

Nasri should then have done better when Kakuta's tame back-pass presented him with the ball 10 yards from goal, but Cech was out quickly to block.

With 18 minutes left, Walcott was replaced by defensive midfielder Abou Diaby who made his first appearance since mid-October, before Marouane Chamakh came on for Van Persie.

Diaby's close-range effort was blocked by Frank Lampard and Kakuta's bundled effort was ruled out for offside as the Gunners closed out for a long-overdue victory against their championship rivals and moved within two points of leaders Manchester United, albeit having played a game more.

Arsenal  Fabianski, Sagna, Djourou, Koscieiny, Clichy, Song, Fabregas (Rosicky 88), Wilshere, Walcott (Diaby 73), van Persie (Chamakh 76), Nasri
Subs Not Used  Szczesny, Squillaci, Arshavin, Bendtner
Booked  van Persie, Fabregas
Goals  Song 44, Fabregas 51, Walcott 53

Chelsea  Cech, Ferreira (Bosingwa 61, Ivanovic, Terry, Cole, Essien, Mikel (Ramires 46), Lampard, Kalou, Drogba, Malouda (Kakuta 56)
Subs Not Used  Turnbull, Van Aanholt, Bruma, McEachran
Booked  Cole, Kalou, Lampard
Goals  Ivanovic 57

Attendance  60,112

Referee  M. Clattenburg