the greatest revenge rampage

No one was physically harmed but the rampager. I refer to the 2004 ARMORED BULLDOZER RAMPAGE in Colorado by one Marvin Heemeyer. Angered over a zoning dispute (in which it does sound like he got a raw deal, I must say) Heemeyer simply destroyed many buildings owned by his enemies, then finally committed suicide. And the unusual thing is that he had been planning the assault for 18 months.

“The machine used in the incident was a Komatsu D355A bulldozer fitted with makeshift armor plating covering the cabin, engine and parts of the tracks. In places, the vehicle’s armor was over one foot thick, consisting of concrete sandwiched between sheets of steel to make ad-hoc composite armor. This made the machine impervious to small arms fire and resistant to explosives; three external explosions and over 200 rounds of firearm ammunition fired at the bulldozer had no effect on it. National Guard units were placed on standby orders by Governor Bill Owens for possible anti-armor support…

For armament the bulldozer was fitted with a .50 caliber semi-automatic Barrett M82 rifle pointing out to the rear, a semi-auto variant of the FN FNC in front, a .223 Ruger Mini-14 to the right, a 9mm Kel-Tec P-11 semi-auto pistol and a .357 magnum revolver with which he killed himself.”