The north London side took the lead in the 41st minute when Olivier Giroud latched on to David Meyler’s misplaced pass to fire home.
The French striker then fired in Walcott’s cross to make it 2-0 in the 71st minute.
Walcott made it 3-0 shortly after, before adding further gloss to the scoreline in the 88th minute.
The result means that Arsenal will now play Watford at Emirates Stadium on Sunday afternoon for a place in the semi-finals as the Gunners look to win the competition for the third straight year.
And Chambers and Walcott were among the stars to voice their reaction to the game on social media.
Here is some of the best reaction from Arsenal’s players after Tuesday’s thumping win.
Theo Walcott: “Good result & performance. Onto the quarters. #COYG #emiratesfacup”
Calum Chambers: “Solid team performance! Great to see Theo & Giroud on the scoresheet! We had to do it #COYG”
Jeff Reine-Adelaide: “Great win #FACUP”
— Joel Campbell (@joel_campbell12) March 8, 2016
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news