 Complete the following phrase:  From 1954 to 1955, he was part of the Mercedes-Benz factory team, as a junior driver behind Juan Manuel Fangio, Karl Kling, Hermann Lang and later Stirling Moss. When the Silver Arrows came back for the 1954 French Grand Prix to score a 12 win, Herrmann drove the fastest lap but had to retire. A podium finish at the 