The ancient province of Gunma was a center of horse breeding and trading activities for the newly immigrated continental peoples (or Toraijin).

From this point forward, the horse became a vital part of Japanese military maneuvers, quickly displacing the older Yayoi tradition of fighting on foot.

[citation needed] When Mount Haruna erupted in the late 6th century, Japan was still in the pre-historical phase (prior to the importation of the Chinese writing system during the Nara period).

The Gunma Prefectural archaeology unit in 1994 was able to date the eruption through zoological anthropology at the corral sites that were buried in ash.

[citation needed] In the past, Gunma was joined with Tochigi Prefecture and called Kenu Province.

[citation needed] The Tenmei eruption of Mount Asama occurred in 1783, causing enormous damage.

[8] The Girard incident, which disturbed US-Japanese relations in the 1950s, occurred in Gunma in 1957, at Sōmagahara Base [ja] near Shibukawa.

In 2007, the Ministry of Agriculture, Forestry and Fisheries held an event to find the top 100 best local dishes across all of Japan.

2,559 grooves cut into a 175-meter stretch of the road surface in transmit a tactile vibration through the wheels into the car body.

[13][14][15] The roads can be found in Katashina, Minakami, Takayama, Kanna, Ueno, Kusatsu, Tsumagoi, Nakanojo, Takasaki, Midori, and Maebashi.

Gunma was the only prefecture in Japan to have all 4 legal types of gambling on races: horse, bicycle, auto and boat.

For marketing, the Prefectural Government also uses Gunma-chan, a small super deformed drawing of a horse character wearing a green cap.