Sam Underhill's 'unbelievable' tackle in a million keeps England Grand Slam hopes alive after edging past Wales

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The man whose astonishing act of never-say-die defiance rescued England from the threat of a first home defeat under Eddie Jones revealed afterwards that he was driven by 'sheer panic'.

Sam Underhill confounded logic, reason and physics on Saturday at Twickenham.

Just after the hour, Wales were on the charge and the hosts were manning the barricades in a desperate bid to protect their lead — having not scored a point themselves for more than 40 minutes.

Sam Underhill was hailed as England's saviour as they narrowly beat rivals Wales on Saturday

His last-ditch tackle on Wales' Scott Williams secured a vital Six Nations win for England

Warren Gatland's side surged into space on their left flank and Scott Williams found himself with a straight, short run to the corner. A try seemed inevitable. It never came.

The Scarlets centre tried to use the wet surface to his advantage with an early slide for the line, but Underhill somehow managed to flip him over, into touch by the flag, even though the ball-carrier was so low that all he could do was fling his trailing right arm at him, as hard as possible.

Williams is a sturdy customer, so forcing him off the field, without the driving force of a proper hit with the shoulder, was a staggering feat. It encapsulated the English rearguard action which propelled them to a record 15th consecutive home Six Nations win. They had to hang on, but hang on they did.

Underhill came on at half-time, as a replacement for the injured Sam Simmonds, for his championship debut. The rookie flanker is already renowned for his tackling prowess, but this was on another level — an instant addition to Twickenham folklore. And it all stemmed from the fear he felt when he lost his footing seconds earlier. 

Williams looked to have scored the match-winning try but he was denied by Undehill

'I think they were on our 22 and I remember slipping over — then I remember sheer panic,' he said. 'Then I remember just pegging it to the corner because I've slipped over and they had an overlap. I'm so glad I made it in time. I wish it was more than that, but it honestly wasn't.

'You're looking for a technique behind it, but it's a rare occurrence and it's the same as most tackles: it's just your intent to get there, your attitude and what you do before that I guess is important.'

Underhill's own modesty was offset by the awe of his team-mates. They were in no doubt about the magnitude of the tackle that kept England's title challenge on track, on a wet and wild day which saw Wales push them to the brink. 

Underhill's tackle to force Williams into touch was described as 'unbelievable' by Owen Farrell

'That tackle by Sam Underhill was unbelievable — one of the best you'll see,' said Owen Farrell. 'He (Williams) dived early, but it was slippy, so he might have got there. But it was a proper contact by Sam. Normally people get there and try to get them into touch.

'He got in close, flipped him over and didn't even give him the chance to place the ball. He's a tackling machine.' 

Farrell delivered a crucial hit of his own soon afterwards, to stop the rampaging Aaron Shingler in his tracks and force a knock on — leading to a fist-pumping celebration. And at the end, when it had become a one-score game, England collectively held the line to deny Wales the platform to go for glory. A final-quarter tactical shift, to stop contesting breakdowns, proved effective.

Joe Launchbury (right) kept making tackles and hitting rucks in a herculean performance 

Gareth Anscombe's switch to fly-half ignited Wales' second-half revival and Shingler galloped around Twickenham like he owned the place. But those in white showed dogged resilience. Joe Launchbury kept making tackles and hitting rucks, in a herculean effort to go with the magical offload he produced earlier to create Jonny May's second try. Chris Robshaw was another who never stopped grafting, as ever. 

Further back, George Ford demonstrated all his awareness and canny decision-making. One clever, delayed pass to send Farrell bursting clear came just as he was shaping to kick but spied a mismatch and quickly changed the play, on the hoof. Alongside him, Farrell was a beacon of English aggression, intensity and tenacity, having started the game with a perfect diagonal kick for May's first try.

Eddie Jones later said of Farrell: 'I was impressed by his leadership, his toughness, his will to win… he was absolutely outstanding.'

Head coach Eddie Jones praised the leadership shown by Farrell in particular

The same words could have been said of Mike Brown, who was in his element – commanding in the air and on the turf; breaking tackles and making ground repeatedly.

Much of the aftermath of this match was dominated by raging debate over the TMO's decision not to award Wales a try in the first half.

For the record, this observer's view is that the visitors were robbed. It should have been given. But, the better team won and there is every reason to suspect that even if the TMO had not blundered, Jones' side would have found a way to prevail. That is the handy habit they have established.

England still have much to work on but will head to Scotland as the heavy favourites

Next up for England is a Calcutta Cup showdown with Scotland at Murrayfield on February 24. There is much to work on, after a scoreless last hour against Wales which left them in a fight to the finish — never part of the master plan. But they will head north of the border as favourites.

While Gatland and his men could take comfort from their second-half surge and the emergence of depth across the board, Jones was satisfied by the varied victories his team have secured so far.

'We're two from two,' said the Australian. 'We won with a bonus point in Rome and the other game was an arm wrestle that we managed to win, so we've had the experience of a loose game and a tight game.'

It was certainly tight on Saturday, but the Sweet Chariot rumbles on, thanks to Underhill and his panic-stricken intervention.