Breakfast cereal he launched the Cornflakes brand, which overnight captured a national market. Soon there were forty rival manufacturers in the Battle Creek area. His brother William K. Kellogg (1860–1951) worked for him for many years until, in 1906, he broke away, bought the rights to Cornflakes, and set up the Kellogg Toasted Corn Flake Company. William Kellogg discarded the health food concept, opting for heavy advertising and commercial taste appeal. Later, his signature on every package became the company trademark. The second major innovator in the cereal industry was Charles W. Post, a salesman who was admitted to Kellogg's sanitarium as
Operation Cornflakes the mail train and the planting of the mailbags of propaganda (Cornflakes) amongst the debris. The first mission of Operation Cornflakes took place on 5 January 1945, when a mail train to Linz was bombed. Bags containing a total of about 3800 propaganda letters were then dropped at the site of the wreck, which were subsequently picked up and delivered to Germans by the postal service. Within 1944–45 twenty missions had been completed, reporting a success rate of 50%, leaving the 15th Air Force with over 320 delivered mailbags of propaganda. A major oversight by the OSS and its task