 Lichtenfeld quickly discovered, however, that actual fighting was very different from competition fighting, and although boxing and wrestling were good sports, they were not always practical for the aggressive and brutal nature of street combat.It was then that he started to re-evaluate his ideas about fighting and started developing the skills and techniques that would eventually become Krav Maga.Having become a thorn in the side of the equally anti-Semitic local authorities, in 1940 Lichtenfeld left his home with his family and friends on the last refugee ship to escape Europe.