Koscielny hails Arsenal steel shown for Everton win
The French defender felt the steel they showed was crucial in taking the three points.
"It's not just the four defenders, it's all the team," Koscielny said.
"Robin (van Persie) made a lot of effort to help us, so it's all the team who defend and attack and we did the job very well.
"We need to carry that into the next game against Aston Villa at home (on Saturday)."