The second of two principles contained in the "Just War Theory," Jus Ad Bellum and Jus In Bello. Jus In Bellum in Latin means "The Law in Waging War." It defines
standards by which
a country can conduct war maintain that they have "just" actions in war. The term was coined
in the same era in which
the League of Nations originated. However, it was not used in doctrine until
1940s. Its principles include discrimination
Descrimination defines legitimate
targets and proportionality defines
how much force to be used.
Under the guidelines
of Jus In Bello, the attack on Heroshimo, Japan by US forces with the use of the atomic bomb
violates both the guidelines
of descrimination and proportionality.