History: War Photography

From late Old English (c.1050), wyrre, werre, from Old North French werre "war" (Fr. guerre), from Frankish werra, from Proto-Germanic werso (Compare with Old Saxon werran, Old high German werran, German verwirren "to confuse, perplex"). Cognates suggest the original sense was "to bring into confusion."
There was no common Germanic word for "war" at the dawn of historical times. Spanish, Portuguese, Italian guerra are from the same source; Romanic peoples turned to Germanic for a word to avoid Latin "bellum" because its form tended to merge with bello- "beautiful."
In an organized military sense, a group of combatants and their support is called an army on land, a navy at sea, and an air force in the air. Wars may be conducted simultaneously in one or more different theaters. Within each theater, there may be one or more consecutive military campaigns. A military campaign includes not only fighting but also intelligence, troop movements, supplies, propaganda, and other components. A period of continuous intense conflict is traditionally called a battle, although this terminology is not always applied to conflicts involving aircraft, missiles or bombs alone, in the absence of ground troops or naval forces. Also many other actions may be undertaken by military forces during a war, this could include weapons research, internment, assassination, occupation, and in some cases genocide may occur.