the teen years, similar to the Rumely oil pulls. During World War I, Case's sales and demand grew dramatically in Europe. These increases were directly connected to the war; as many farm laborers became soldiers, each remaining farmer needed to become more productive, and machinery was the way to make this happen. In 1919, John Deere entered the harvester business, and International Harvester's reply to their new competition was to purchase P&O Plowing of Canton, Illinois, and the Chattanooga Plowing company of Chattanooga, Tennessee. Henry Ford also entered the tractor business with his Fordson Tractor produced at the massive Rouge River plant. An economic downturn during the early 1920s dampened tractor sales; price-cutting to stimulate demand sparked a price war in the tractor industry (called the tractor war). Ford, with a massive advantage in manufacturing capacity and distribution, had the upper hand, producing an estimated 73 percent of all American tractors, with IHC in a far away second place at nine percent, and several other companies sharing the rest of the percentages. In 1923, the IHC Farmall entered the agricultural industry, and Ford's stranglehold began to slip. That same year also, the 100,000th thresher machine produced by Case made its way out of the assembly line, marking an important milestone for the Case company. In 1927 the J. I. Case Company ceased building its legendary steam engines. Case steam engines, of which over 30,000 were produced, were painted in black with green machinery, while the gas tractors were painted grey. In 1939, Case changed its color scheme to Flambeau Red, with the excavators being a ruddy yellow. By 1929, Case had expanded to Australia, Mexico, Sweden, and other countries. Also that year, the J. I. Case Company produced its first crawler tractor. S and V tractors were introduced in 1940. Automobile production Automobiles produced by Case during the period 1911-1925/1927 include: the Case Jay-Eye-See Brougham (named for Case's horse) and Case Touring-Y. Work in the Second World War Case evolved as World War II arrived by becoming involved in the manufacturing of shells for the United States and allied forces military, as well as airplane parts for the B-26s, bombs, and doors for the Sherman Tank. Three new plants were opened across the United States during that year, and, in 1942, the company produced its first self-propelled combine. That same year, Case released the company's first cotton picker, which is