Delta wings - wings in the form of triangle. Used i.e. in Eurofighter (German), F-106 Delta Dart (USA), Vulcan (GB). Such wings have better aerodynamic parameters in supersonic speeds, are stronger, than normal wings and can be built from lighter materials.
In 7-8 september the 1939 during the inital phase of war the great battle beetween Polish and German troops took place - battle of Wizna. In this battle, German forces were some 60 times stronger than the Polish defenders!