England and Jude Bellingham have both set European Championships records following the win over Croatia.
It comes as Raheem Sterling scored his first goal at a tournament for the Three Lions to see off the 2018 World Cup finallists.
And amid all the furore prior to kick-off, Southgate opted to go with some experienced heads in his line-up.
Kieran Trippier, 30, was started ahead of Luke Shaw and Ben Chilwell at left-back while Jadon Sancho was left out of the squad entirely.
But one player to make an appearance was Bellingham, who came on for Harry Kane in the second-half as a substitution.
At just 17, he is the youngest player to ever play at the Euros since it started.
The Borussia Dortmund starlet became England’s youngest player of all-time to feature at a major tournament as well, including the World Cup.
The teenager turns 18 on June 29, towards the end of the month, but plays beyond his years for club and country.
It speaks volumes that Southgate turned to the ex-Birmingham ace to help see out the game against a midfield containing the likes of Ballon d’Or winner Luka Modric and Serie A champion Marcelo Brozovic.
Bellingham’s age can be denoted by the fact that Bring Me To Life by Evanescence was top of the charts while the fifth Harry Potter book Order of the Phoenix by J.K Rowling had just been published.
Remarkably, the 1-0 win over Croatian was the first time England have claimed victory in their first group match.
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Euro 2004 started with a dramatic 2-1 loss to France where Zinedine Zidane scored twice in injury-time, 2016 kicked off with a disappointing 1-1 draw against Russia and even 1996 began with a draw against Switzerland.
As for Bellingham, many clubs in the Premier League are keen on signing the England international but Dortmund are keen to keep hold of the midfielder.
The Bundesliga club set a record when they signed him from St. Andrews for £25m – making him the most expensive 17-year-old in football ever.
They beat Manchester United to his signing, who had Sir Alex Ferguson show him around their Carrington training complex in a bid to convince him to join.
The Red Devils remain interested, while Chelsea are another club to up their efforts to sign the wonderkid.