He should also be given credit for insisting his players practice penalties, even bringing in a psychologist to help them, after a succession of his predecessors wrote the whole process off as a lottery beyond their control. As they contemplated 30 minutes of extra time, Southgate huddled his young squad together and encouraged them to press the reset button.
In the shoot-out, David Ospina plunged to his left to keep out Jordan Henderson's poor penalty and give Colombia the advantage, but Mateus Uribe struck the crossbar and Jordan Pickford denied Carlos Bacca brilliantly to give Dier the chance to win it for the Three Lions.
Gareth Southgate's rejuvenated England side who have breathed a new life into English football with fans really starting to believe the Three Lions can go all the way in FIFA World Cup 2018 in Russian Federation.
"To get knocked down at the end like we did with that goal in extra time, you know, it's hard to come back from that". Many commented online how the win has laid to rest Southgate's ghosts from 1996.
England take on Sweden in Samara on Saturday looking for a place in the World Cup semi-finals.
Seven of England's nine goals so far at this World Cup have come from set-pieces but Sweden's aerial ability could threaten to nullify this option more than most opponents to date.
"A bit of apprehension for tonight but I think they'll go at it like they didn't against the Tunisians, hopefully score in the first 20 minutes".
People hurled plastic cups of beer in the air as hundreds jumped around and chanted "It's coming home".
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"It was a top class save and I was surprised he could reach it given his height", he said with a grin.
"It was very nervy, we done it the hard way but we done it".
The game at Spartak Stadium, Moscow, starts at 9 p.m. local time, or 2 p.m.
Many England fans expressed nerves on Twitter.
The penalty which led to England's breakthrough was awarded in the 52nd minute as midfielder Carlos Sanchez, who had been lucky to escape punishment for previous incidents, wrestled Kane to the ground.
Erika Rodriguez who was born in Britain but whose family are from Cali in Colombia, said the loss "just sucks". I thought it was a good game.
"When something goes wrong in your life it doesn't finish you and you should become braver, knowing that you've got to go for things in life and don't regret (that) you didn't try to be as good as you might be", said Southgate.
"Our historic record against them is another one we have to put right, but I think we have always viewed them at our level and I don't think that's right because their tournament record is better than ours".