Brian O'Driscoll believes that England's victory over Ireland on Sunday is a "blueprint" for other sides facing Andy Farrell's team.
"Ireland had looked like the team in better form coming into it," said O'Driscoll on ITV's coverage of the game.
It just shows how difficult it is to win away from home, to come to Twickenham; we might have won a few in the past but we've had some big beatings here as well and you have to be mindful of that.
This English team showed the world the blueprint of how to beat Ireland. It's about out-muscling them, beating them up upfront, without the ball or without it, [and] dominating them in the set-piece.
That's Ireland's Achilles heel. When New Zealand, when South Africa, when France and England, when those big sides come at them, they just don't have the answers. Even during their successful period of five or six years under Joe Schmidt, when they came up against the bigger sides, that's where we struggled.
We're just going to have to take that one. That's a tough one. You don't have answers immediately. I'm not surprised Andy Farrell looked unsure because I'm sitting in the studio thinking, 'Where do we piece this together?'
England scored two first half tries off kicks behind the Ireland defence. Errors from Johnny Sexton and Jacob Stockdale aided England in both plays.
"They absolutely exposed guys that maybe aren't used to covering every blade of grass that is expected of them," said O'Driscoll of the tried.
"Jacob Stockdale, he'll learn from that as well, he's got to get closer to the ball, own the space and not allow Elliot Daly come through.
"There's going to be huge disappointment for this Irish team. There was a Triple Crown on the line and they were playing one of the best teams in the world.
"Sometimes you've just got to lick your wounds and get on with it, park the negatives and look at what you've done well in the first two games, what you can take out of this and bounce back with a big performance against Italy."