Albion brought an end to an eight game winless run with a superb 2-1 victory at the Emirates on Saturday.
Leandro Trossard's fifth goal of the season after 29 minutes gave Albion something to build on and Enock Mwepu marked his return to the starting line-up with a stunning half-volley midway through the second half.
Arsenal pulled one back in the 90th minute when Martin Odegaard struck from distance and Albion's fans in a packed away end had to endure six minutes of added time before taking the acclaim of a packed away end.
Of the three Albion changes it was the inclusion of Moises Caicedo that caught the eye, as the Ecuador international came in for his Premier League debut. The 20-year-old, alongside Mwepu and Yves Bissouma replaced Neal Maupay, Tariq Lamptey and Solly March.
Gabriel Magalhaes would rue nodding into the side-netting after 26 minutes when two minutes later Trossard curled home emphatically to put the visitors in the lead.
Lewis Dunk’s brilliant ball from the centre of defence down the right flank for Mwepu was expertly controlled by the Zambia captain, who got to the by-line, pulled it back and Trossard, timing his run perfectly, bent a right-foot shot into the top right corner from 12-yards.
It injected some life into a game after an opening third that had seen Albion put in a well drilled performance to frustrate the visitors.
Bissouma was yellow carded for halting a counter-attack and Lewis Dunk had to put in a well-timed block on an Odegaard effort as the Gunners looked to respond, but it was a prolonged VAR check that would ensure Albion’s lead was intact going in at half-time.
Gabriel Martinelli nodded in from centre-back Garbiel’s header back across goal, but after a check that took the best part of three minutes, VAR official Chris Kavanagh concluded that the striker was offside.
The home supporters were losing their patience as Albion kept Arsenal at arm's length and the visitors only added to their frustration when Enock Mwepu half-volleyed in from the edge of the box 20 minutes into the second half.
Caicedo played a sumptuous one-two with Cucurella, digging out a cross for Mwepu to crack into the bottom left corner, sending the away support into raptures.
Albion seemed to have managed the closing stages pretty well but the drama wasn't over. Odegaard and Sambi Lokanga were both denied by the bar as Odegaard's free kick came back off the frame of the goal and his teammate's follow-up hit more or less the same spot.
But Odegaard did make it 2-1 with a long-range effort that beat Sanchez with a deflection off Danny Welbeck and it was all hands to the pump in stoppage time when Sanchez made a couple of important saves. A nervy finale certainly, but Albion deserved to cling on to three points.
Albion: Sanchez, Cucurella, Dunk, Bissouma (Lallana 74), Mac Allister, Trossard (Webster 84), Mwepu (Lamptey 77), Gross, Welbeck, Caicedo, Veltman.
Unused subs: Steele, Maupay, Alzate, March, Offiah, Sarmiento.