Until the 19th century the majority of battles were of short duration, many lasting a part of a day. (The Battle of Nations (1813) and the Battle of Gettysburg (1863) were exceptional in lasting three days.) This was mainly due to the difficulty of supplying armies in the field, or conducting night operations. The means of prolonging a battle was typically by employment of siege warfare. Improvements in transportation and the sudden evolving of trench warfare, with its siege-like nature during World War I in the 20th century, lengthened the duration of battles to days and weeks.[8] This created the requirement for unit rotation to prevent combat fatigue,[9] with troops preferably not remaining in a combat area of operations for more than a month. Trench warfare had become largely obsolete in conflicts between advanced armies by the start of the Second World War.
The use of the term "battle" in military history has led to its misuse when referring to almost any scale of combat, notably by strategic forces involving hundreds of thousands of troops that may be engaged in either a single battle at one time (Battle of Leipzig) or multiple operations (Battle of Kursk). The space a battle occupies depends on the range of the weapons of the combatants. A "battle" in this broader sense may occupy a large piece of spacetime, as in the case of the Battle of Britain or the Battle of the Atlantic. Until the advent of artillery and aircraft, battles were fought with the two sides within sight, if not reach, of each other. The depth of the battlefield has also increased in modern warfare with inclusion of the supporting units in the rear areas; supply, artillery, medical personnel etc. often outnumber the front-line combat troops.
Battles are, on the whole, made up of a multitude of individual combats, skirmishes and small engagements within the context of which the combatants will usually only experience a small part of the events of the battle's entirety. To the infantryman, there may be little to distinguish between combat as part of a minor raid or as a major offensive, nor is it likely that he anticipates the future course of the battle; few of the British infantry who went over the top on the first day on the Somme, July 1, 1916, would have anticipated that they would be fighting the same battle in five months' time. Conversely, some of the Allied infantry who had just dealt a crushing defeat to the French at the Battle of Waterloo fully expected to have to fight again the next day.
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