Describe what took place at kent state massacer

The Kent State shootings (also known as the May 4 massacre or the Kent State massacre)[3][4][5] were the shootings on May 4, 1970 of unarmed college students by members of the Ohio National Guard at Kent State University in Kent, Ohio during a mass protest against the bombing of Cambodia by United States military forces. Twenty-eight guardsmen fired approximately 67 rounds over a period of 13 seconds, killing four students and wounding nine others, one of whom suffered permanent paralysis.[6][7]