we all know about the monday night wars of course.
However there was a big war between All Japan and New Japan at one point.
http://wiki.puroresu.com/New_Japan_P...romotional_War
New Japan and All Japan were having a promotional war, in which both groups took gaijin stars from each other. Tiger Toguchi, who was at the time the third star of All Japan, Dick Murdoch, and All Japan's top heel Abdullah the Butcher jumped to New Japan in 1981. Later in the year, the fans saw two top gaijin stars of New Japan, Tiger Jeet Singh and Stan Hansen, in All Japan. All Japan also took the British Bulldogs, Dynamite Kid & Davey Boy Smith in 1984, and New Japan took Bruiser Brody the following year.
While the promotional war was taking place, the importance of the gaijin talents declined. The triangle feud between New Japan (Inoki, Sakaguchi, Fujinami, Tiger Mask, etc.), the former IWE wrestlers (Rusher Kimura, Animal Hamaguchi, & Isamu Teranishi), and Kakumeigun (Masa Saitō, Riki Chōshū , Killer Khan, & Kuniaki Kobayashi) was the hottest thing around this time.
However, after few years of what was probably the best days of New Japan since its start in 1972, many Japanese wrestlers left the company. In the summer of 1983, Tiger Mask announced his retirement, followed by a coup within the office which took Inoki, Sakaguchi, and Shinma from their respective positions as president, vice president, and business manager. Inoki and Sakaguchi soon returned to their positions, but Shinma was never welcomed back.