It was a statement of overwhelming superiority from a marque returning to racing after a 15-year absence.
The W196, designed by the brilliant Rudolf Uhlenhaut, was a genuinely revolutionary car, featuring a straight-eight engine, inboard drum brakes, and a streamlined body that shocked the paddock.
The car was so advanced that rivals struggled to comprehend how it could be legal, let alone beaten.
The car was the result of a methodical, lavishly resourced programme that left absolutely nothing to chance, and the Reims result showed it.
Mercedes would dominate F1 that year and again in 1955, before withdrawing following the Le Mans disaster.
March Engineering (1970 South African GP)
Marches lead the way at the start of the 1970 season in Kyalami
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Few origin stories in Formula 1 are as audacious as that of March Engineering.
The team was the brainchild of four young men: Max Mosley, Alan Rees, Graham Coaker, and Robin Herd who each invested £2,500 to get the project off the ground, operating out of a modest unit on a Bicester industrial estate.
Their ambition was wildly disproportionate to their resources: they intended to design, build, and race a competitive F1 car from scratch, and to do it in months rather than years.
As Mosley himself later recalled, the feeling in the pitlane was that March was somehow taking liberties and that serious Formula 1 teams simply were not built this way.
At the 1970 South African Grand Prix in Kyalami, however, the scale of what they had achieved became undeniable. Jackie Stewart and Chris Amon — both in Marches — occupied the entire front row.