Germany coach Juergen Klinsmann said the crowd in Berlin's Olympiastadion had helped to drive his team to the 3-0 win over Ecuador yesterday.
"When you play at home you have the crowd behind you and that gives the players an extra push. It's World Cup fever," Klinsmann said.
"Our goal was to win the group and we achieved that. It was difficult to keep the pace up because it was hot out there but overall we are happy and looking forward to the knockout games."
Ecuador coach Luis Fernando Suarez said his team had not been at their best.
"Germany played a great match but we contributed to their good display," he said.
"I don't want to take away from the performance of the German team but I think we could have done better."