Livewire pace was the important behind Southampton's 4-0 win more than Arsenal, based on two-goal hero Shane Lengthy.
Arsene Wenger's side came into the match just after a 2-1 win against Premier League title rivals Manchester City, but a woeful defensive show resulted inside a resounding defeat at St Mary's Stadium.
Extended scored twice and hit the post as Southampton ended a five-game winless run in the top flight along with the Irishman felt Arsenal had no response to the speed inside his team's ranks.
"We brought on them problems on the break and they did not like the pace in behind from me and Sadio [Mane] and we played on that," Long told BT Sport.
"We knew we were a fantastic sufficient group, we knew we could play football, however it was not happening in the final few weeks.
"We went around using the mentality of fighting hard for each other firstly and hoping the play comes from there.
"It was an excellent day all round, but we've got got a challenging game coming up in two days' time against West Ham."
Cuco Martina set Southampton on the path to victory having a sublime 25-yard opener using the outside of his boot.
It was the Curacaoan's initial Premier League appearance since September, and Extended praised the work the 26-year-old place in to return towards the starting line-up.
"He's been brilliant in instruction, functioning truly tough and deserved his likelihood within the team," he added.
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