The build-up to the Nations League fixture was overshadowed by the incident outside the Green Man pub, an establishment frequented by fans before Three Lions matches.
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The Metropolitan Police confirmed the group who carried out the attack were wearing England hats and scarves, however, it's believed they were in fact German.
The Met added that 'a number of people' sustained head and facial injuries and are aware of three people that sustained serious leg, wrist and thumb injuries.
It was confirmed that four arrests were made in relation to the disorder.
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A statement read: "At 5:50pm on Monday 26th of September a group of approximately 100 males, many wearing masks, approached a pub in Dagmar Avenue in Wembley through an alley leading towards the car park.
"Whilst a number of the group were wearing England hats and scarfs it's believed they were German fans.
"The group entered the beer garden and began assaulting customers, most of whom were in the area to attend the England v Germany match.
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"Punches and projectiles, including traffic cones were thrown. Officers responded and the group fled. The disorder lasted for around two minutes.
"A number of people sustained head and facial injuries. We are also aware of three people with serious leg, wrist and thumb injuries. None of those injured are believed to be in a life-threatening condition.
"There have been four arrests so far in relation to the disorder."
Meanwhile, an eyewitness - Luke Robinson - told i: "There's an entrance at the back of the Green Man and about 50 of them turned up wearing masks and England scarves.
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"They stormed in, were hitting anyone and everyone. It was going on for a good five minutes before the police arrived.
"A lot of people were in a bad way. People were on the floor, unconscious, covered in blood. Even kids — one lad no older than 13 had a bleeding nose.
"One guy was with the paramedics and still unconscious when we left.
He added: "It's the main England pub. I've never seen it like that before and I come to every home game. We were there when England played Germany in the Euros and when there was all the trouble around the final, but this is the first time I've seen it like it."
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The game itself finished 3-3 with England coming back from 2-0 down to pick up a point against Germany.
The Three Lions fell 2-0 behind after Harry Maguire gave away a penalty which Ilkay Gundogan converted, and then the much-maligned defender gave the ball away in the build-up to a fine Kai Havertz strike.
But goals from Luke Shaw, Mason Mount and a Kane penalty put the hosts 3-2 ahead before goalkeeper Nick Pope's error gifted Havertz a second to deny England a win in their final match before the World Cup.