At 3-2 up the Foxes looked set for a surprise win that would have sent shockwaves throughout the league but Aaron Ramsey's composed finished and Giroud's header meant Arsene Wenger started his 21st campaign in charge of Arsenal with a win.
Arsenal fought back again, though, with Ramsey coming off the bench to score an equalizer in the 83rd minute, netting from close range and a right-sided angle to make it 3-3. It was one of the great days for me in recent weeks [when he said he would stay]. Numerous times at the back end of last season they found winners late on.
Still, not the ideal start for Shakespeare as a manager who has spent plenty of cash ahead of first full season in charge in the Premier League.
Once they are back and available, Welbeck is hopeful that future results can be earned in less trying circumstances.
"We're gonna win the league!" sang the Leicester fans and they nearly had a third goal to cheer when Okazaki's header from Christian Fuchs's cross bounced just wide of Cech's left-hand post.
Craig Shakespeare's side boasted numerous players, and characteristics, that saw them shock the world to win the title in 2015/16.
Wenger, facing vast pressure for going over a dozen years without winning the league, used some ballsy tactics, starting one center back (Rob Holding) in a 3-4-3 formation. We have a game backed on mobility and technique and I think he can integrate that well.
"Lacazette is simple - in every game he's stronger since he joined us", said Wenger, who had seen his side lose at home in three of their previous four opening league fixtures.
Despite only starting 17 games last season in all competitions, Giroud still scored 16 times " including an eye-catching scorpion-style kick against Crystal Palace.