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In page Guerrilla warfare:

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T. E. Lawrence, best known as "Lawrence of Arabia", introduced a theory of guerrilla warfare tactics in an article he wrote for the Encyclopædia Britannica published in 1938. In that article, he compared guerrilla fighters to a gas. The fighters disperse in the area of operations more or less randomly. They or their cells occupy a very small intrinsic space in that area, just as gas molecules occupy a very small intrinsic space in a container. The fighters may coalesce into groups for tactical purposes, but their general state is dispersed. They are extremely difficult to "defeat" because they cannot be brought to battle in significant numbers.[citation needed]