Military art is art with a military subject matter, regardless of its style or medium. The battle scene is one of the oldest types of art in developed civilizations, as rulers have always been keen to celebrate their victories and intimidate potential opponents. The depiction of other aspects of warfare, especially the suffering of casualties and civilians, has taken much longer to develop. As well as portraits of military figures, depictions of anonymous soldiers away from the battlefield have been very common; since the introduction of military uniforms such works often concentrate on showing the variety of these.