August 18 1976. The Korean Axe Murder Incident.
The above picture is actually of what it caused, "Operation Paul Bunyan"
A group of RoK and US soldiers at the DMZ were ordered to prune a tree (pictured here). The North Korean garrison nearby watched for 15 minutes before their commander, nicknamed "Lt. Bulldog" by the US troops because he would constantly and angrily confront anyone who entered the area) came out and demanded the US and RoK solider stop, because, and I quote "because Kim Il-Sung personally planted it and nourished it and it's growing under his supervision."
The Rok and US forces ignored the demand, so Lt. Bulldog sent a runner, and then 20 North Korean soldiers arrived with crow bars and began beating the mostly unarmed US and Korean soldiers, eventually murdering 2 Americans with their own axes, including the captain that had taken the part out to begin with.
This directly led to "Operation Paul Bunyan" wherein US, as ordered directly by then President Jimmy Carter, removed the tree to nothing but a 6 foot stump, ordered left to serve as a monument. In that tree trimming, over 2 dozen US aircraft and helicopters circled the area, so the machine gun position set up by the North Koreans immediately after the incident covering the position would know better than to open fire. It went off without a hitch, as over 40 Nork troops watched the US soldiers trim the tree, while South Korean soldiers graffitti'd the the North Korean guardposts that had been abandoned when the airplanes showed