Town show they have a fighting spirit
One of the primary complaints to come out of the weekend debacle against Bournemouth was the lack of fight Huddersfield Town showed as they went down without a whimper against the rampant Cherries.
But when the chips were down at the Proact Stadium, Town responded in the perfect manner to prevent what would have been an extremely unwelcome cup exit after the goings-on of the last few days.
The relief that emanated from the Town end of the ground once Jon Stead had plundered the equaliser was palpable and it felt as if the pressure had eased in one swipe of the striker's left foot and one charitable piece of goalkeeping from Chesterfield's Tommy Lee.
They then pressed on in stoppage time to find the two goals which killed off their plucky hosts and the spirit showed in overcoming two respective two-goal deficits was admirable.
Ultimately Town were expected to progress through and we should not get carried away after a performance which so nearly cost them, but the resilience and never-say-die attitude embodied by each member of the side should equally not be overlooked.
Coady leads the way
One key player in helping Town battle their way back into proceedings against the Spireites was Conor Coady.
His influence may not have been as telling or indeed as noticeable as that of Nahki Wells, but the £375,000 signing from Liverpool oozed class on his full debut for the club.
His five-yard passes were not fancy but they were exactly what Town required to keep them ticking over and his ability to find space and therefore open up gaps for others was vital to the cause.
But it was his leadership skills which was the most evident aspect of his impressive outing as he cajoled his team-mates frequently and never shied away from receiving the ball or attempting to win it back.
There was a distinct lack of vocal presences in the weekend defeat to Eddie Howe's side but Coady's first start ensured that would not be the case last night.
Wells takes home the plaudits
Football hinges on the finer details and it could so easily have been that the narrative from the Chesterfield game focused on Wells' profligacy in front of goal rather than his matchwinning treble.
He squandered a number of chances, both in the first and the second half, as Town appeared down and out and his status as the saviour in this match - regardless of his neat second-half header - was looking to be an unfulfilled one.
But when he had the opportunity from the spot to reduce the arrears to just one - and in doing so set up a tense final 10 minutes - he clinically dispatched the penalty high into the net, leaving Lee no chance in the Spireites goal.
Equally, Wells showed the sort of predatory instincts he is renowned for with the goal in extra time which put Town in front for the first time all evening.
It could have all ended so differently for Wells, who would have been one of the most heavily-scrutinised had he not belatedly buried the chances that came his way. Thankfully, he found his shooting boots just when it mattered most.
Town's attacking substitute cavalry help seal victory
If you studied the first half of this match against the second, and the two respective periods of extra time which followed thereafter, purely on footballing terms and not with the benefit of league positioning, then you would have put the hosts down as the Championship side.
They were first to everything, sharper in their passing and had more purpose to their play. Town, meanwhile, looked lethargic and a pale imitation of a second-tier club.
But when you have the armoury of talent caretaker boss Mark Lillis was able to boast at his disposal, the picture is blurred back into Town's favour.
The ineffective Sean Scannell and Danny Ward were withdrawn and up stepped the likes of Radoslaw Majewski and Adam Hammill to supply pace and craft to an otherwise languid attacking midfield department.
Joe Lolley was the third substitute to come on and he certainly made his mark by bundling home the fifth. The personnel available to Town from the bench saw them through after such a poor first half as the home side sat deeper and deeper and paid the ultimate price.
Mark Lillis gets the fans back onside
It was clear just how much the win meant to caretaker manager Mark Lillis when he strode across the Proact Stadium turf at full-time in assertive mood to go and celebrate in fist-pump style with the travelling Town supporters.
Lillis is a huge fans' favourite and that was evident throughout as chants of "Mark Lillis' barmy army" and "Lillis, give us a wave" were bellowed out from the away end. The stand-in boss duly obliged with the latter.
And he, just as much as the fans, deserved this victory for the passion he showed from the touchline, even if it was slightly more reserved than opposite number Paul Cook.
His eagerness at one point to get the ball to the Chesterfield throw-in taker showed just how up for it he was and it resonated with the fans as they bellowed their team on to the win.
The triumph was just reward for Lillis' boldness with his substitutions and decision to field the Terriers in more of a conventional 4-4-2, which seemed to work well with the bodies available.