The story of how Henry Ford sent German speaking Ford Motor Co engineers to help build the “people’s car” factory in 1930s NAZI Germany is very interesting history and I recommend it, and also how Ferdinand Porsche got early release from a French prison by designing the Citroen 2 CV .

Porsche’s wrong headed ideas of how to build a superior tank,
on the other hand,
greatly hurt the NAZI war effort and so helped the Allies.