Brought to the United States from England, a miniature of a stretch of English countryside, reproduced on canvas, is being used by army officers studying tank tactics at the armored force school at Fort Knox, Ky, It represents an 8-by-13-mile section of Salisbury, Wiltshire, with woods of sponge rubber, Lilliputian farm houses, and plowed fields depicted in water colors. Rolling knolls of England’s pastureland are reproduced by the upright sticks that support the 24-by-38-foot canvas at a height that will permit men to walk beneath it. Distributed at strategic points on the canvas are tiny models of tanks, artillery, motorcycles and troops; and five men stand under the canvas holding magnets. As an officer describes a problem for the class, the men contact designated spots with their magnets, moving the various army units about the canvas as the fight progresses. Bursts of artillery fire are simulated by ejecting cigarette smoke through openings in the canvas. Student officers sit on a narrow balcony above the map.