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In page Military science:

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Even until the Second World War, military science was written in English starting with capital letters, and was thought of as an academic discipline alongside physics, philosophy and the medical sciences. In part this was due to the general mystique that accompanied education in a world where, as late as the 1880s, 75% of the European population was illiterate.[citation needed] The ability by the officers to make complex calculations required for the equally complex "evolutions" of the troop movements in linear warfare that increasingly dominated the Renaissance and later history, and the introduction of the gunpowder weapons into the equation of warfare only added to the veritable arcana of building fortifications as it seemed to the average individual.