The Kalderan-Vedran War was a brutal and large historically important conflict that occurred between the growing Vedran Empire and the Kalderan Commune. Chronologically, it occurred in C.Y. 870 to C.Y. 895, in the Vedran Empires' early history. It is a notable conflict because it is a significant uprising and the first sign of resistance against the Vedran Empire. It was also the first time that an alien species attacked the Vedrans and also did quite well.