The build-up to Roy Hodgson's first tournament as England boss two years ago was marred by injury.
Gareth Barry, Frank Lampard, John Ruddy and Gary Cahill all had to withdraw through injury just before Euro 2012 began.
The England manager was delighted, therefore, that his squad came through Friday's game against Peru without any major problems.
"The most important thing for us was to come through it unscathed, injury-wise," he said.
The only man to suffer a slight problem was Leighton Baines, who was substituted with a minor calf injury.
"(Taking him off) was caution on our part," said Hodgson, who replaced Baines with debutant John Stones.
"He could have continued but the game was over."
Hodgson confirmed that Phil Jones, Alex Oxlade-Chamberlain and Luke Shaw would all travel to Miami with the squad on Sunday despite not appearing among the substitutes against Peru.
"They'll play on Tuesday (against Ecuador)," Hodgson said.
"They could have both played tonight, but I determined they'd start the game on Tuesday and we had a lot of subs on the bench. We thought they'd give them another day's training."
Daniel Sturridge hit a stunning opener before Cahill and Phil Jagielka scored in the second half in England's final game on home soil before the World Cup.
Some of England's play in the first half at a near-full Wembley was laboured, but Hodgson was happy to sign off with a win ahead of next week's training camp in the Florida heat, where England will also play Honduras before flying to Brazil.
"It is the perfect end to a perfect two weeks," the England manager said.
"It was a wonderful send off to the World Cup by a quite incredible crowd. It didn't look as if it would be too comfortable in the first half, but as soon as Daniel scored that wonderful goal the game wasn't in doubt.
"To do it in front of 85,000 people was a great send off, the atmosphere was a vote of confidence.
"When you play against teams with 10 men behind the ball you have to be patient but I had no doubt we would win."
Pacy Peru debutant Jean Reza pierced the England defence on a number of occasions, but Joe Hart kept him at bay.
Peru manager Pablo Bengoechea was happy with his team's performance.
The Uruguayan's countrymen will take on England in their second group match on June 19 and he cannot pick a winner at the moment.
He said: "I'd call it 50-50. They're two strong national teams, and it's a tough, difficult group full of strong sides.
"The key to it all will be the first set of matches. Get three points in the first game and it'll set you up nicely for the group stage."
"This was a warm-up game. I guess the England manager is reasonably satisfied with their performance, but the really tough stuff is still to come."