Cyrus Hall McCormick is known as the inventor of the reaper. He reaped his greatest laurels, however, in making his invention into giant corporation. The McCormick Harvesting Machine Company was among the first American enterprises to turn abroad and reap in foreign fields too. Though intensive use of basic material, this study examines the various stages of the development of the Company into a multinational enterprises. This study is also widened to describe the evolution of the harvesting machine industry, and to cover the outlines of the "reaper war" on both sides of the Atlantic Ocean.