Eddie Jones admitted England had exhausted all of their "get-out-of-jail cards" after edging Wales 21-16 in an enthralling Six Nations showdown in Cardiff.
It took a brilliant try from Elliot Daly with five minutes remaining to complete a 16th successive victory, the Wasps wing galloping onto a pass from Owen Farrell and racing past Alex Cuthbert.
Wales led 16-14 heading into the decisive stage of the match but were unable to withstand the late dominance of England, who also toppled France last weekend with a late try.
"We have used up all of our get-out-of-jail cards and against Italy (on February 26) we don't want to be in that position again," Jones said. "I thought it was a great game of Test rugby. A lot of credit goes to Wales, who were superb. They hit hard and hit often off the ball, which made it a fantastic Test match.
"We have now become a team that is hard to beat and, even when a side beats us, I don't think they are going to beat us, and that is what we want to be like. We are a gritty team with characters in there that don't know how to get beaten, and that was evident here.
"At stages I thought we were going to fade out of the game, but we hung in there making tackles. Courtney Lawes is like a human ice-pack. He has ice all over him after that many tackles and carries. Joe Launchbury as well."
Daly showed his lightning pace when he sprinted across the whitewash to break Welsh hearts, and in the same half he had covered back to prevent Dan Biggar from scoring an intercept try. "The boy's got gas and he's got that x-factor about him and that's what we like him," Jones said.
"I don't necessarily think wing is his best position, but it suits us at the moment. You've got to be running over 10 metres per second to score that try, and he can do that. Elliot might get a run out for Manchester United with that kick out (after Biggar interception). It was a pretty good tackle. He did really well for us."
George Ford and Liam Williams exchanged first-half tries, but it was the final 10 minutes of a high-octane round-two clash that brought a sensational Test to a nerve-jangling climax.
Much had been made of the charged atmosphere awaiting England at the Principality Stadium, and Jones insisted he loved the occasion. "I loved it. It was fantastic. It was a proper Test match. You have got fans giving you stick the whole game," Jones said.
"The crowd is nice and close to the ground, it was a fantastic atmosphere. Maybe next time we'll close the roof - it will be even better. They can close the roof now.
"I can't believe all the things that went on this week about the roof. "The roof should be open unless the conditions are going to be absolutely terrible. That's how rugby should be played because it's a winter sport, so you play the conditions."