The Gunners took the lead inside ten minutes when centre-back Gabriel found space inside the box to meet a right wing corner with an unstoppable header.
Then, with 27 minutes on the clock, Bukayo Saka exchanged passes with Martin Ødegaard to cut through the home defence, before squaring for Leandro Trossard to tap home.
It got worse for the Hammers seven minutes later when Lucas Paquetá clipped Saka in the box and Ødegaard stepped up to convert from the spot.
Kai Havertz was played through by Trossard just two minutes later to add a fourth, and a mad period continued when, on 38 minutes, Aaron Wan-Bissaka slid home to grab one back for the hosts.
The goals kept on coming, and the Irons gave themselves real hope on 40 minutes when Emerson curled a wonderful free-kick past David Raya's despairing dive via the underside of the crossbar, cutting the deficit to two.
You can view a photo gallery from the day by clicking on the image above.
Black Friday
Raising support and awareness for Richard House Children’s Hospice
Club
9 hours ago
Rainbow Laces | Catching up with... Pride of Irons
Fans
10 hours ago
Paquetá | There’s still everything to play for
First Team
12 hours ago
Starting XI | Lopetegui names unchanged team to face Arsenal
First Team
2 hours ago
Raising support and awareness for Richard House Children’s Hospice
Club
9 hours ago
Rainbow Laces | Catching up with... Pride of Irons
Fans
10 hours ago
Paquetá | There’s still everything to play for
First Team
12 hours ago
Starting XI | Lopetegui names unchanged team to face Arsenal
First Team
2 hours ago
Raising support and awareness for Richard House Children’s Hospice
Club
9 hours ago
Rainbow Laces | Catching up with... Pride of Irons
Fans
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