Bertha had one very important mission. She wanted to prove her husband that the automobile, in which they both had invested a large amount of money, is a significant invention and, if marketed, it would become a financial success. She had great technical capabilities and fixed a number of mechanical issues during the trip. Bertha even had to stop in the city of Wiesloch and buy additional fuel from a local chemist, who later was crowned as the first fuel station in the world.
Bertha had to use her garter as insulation material and also cleaned a blocked fuel line with her hat pin. The engine required a large amount of water for cooling, so Bertha, together with her sons Richard and Eugen, thirteen and fifteen years old respectively, had to supply water every time they stopped. Richard and Eugen even had to push the vehicle up steer roads because of the vehicle’s lack of power.
Eventually, Bertha reached her final destination and informed her husband about the successful trip by a telegram. She drove back to her hometown a couple of days later and the rest, as they say, is history
Source: Motor1,Mercedes-Benz USA