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Photos: Remembering the UW-Madison Sterling Hall bombing 50 years ago
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Photos: Remembering the UW-Madison Sterling Hall bombing 50 years ago

  • STATE JOURNAL STAFF
  • Aug 23, 2019
  • Aug 23, 2019 Updated Oct 3, 2025

Early in the morning of Aug. 24, 1970, four anti-Vietnam War radicals — Karleton Armstrong, his brother Dwight Armstrong, David Fine and Leo Burt — used a van filled with almost a ton of ammonium nitrate and fuel oil to bomb UW-Madison's Sterling Hall, killing researcher Robert Fassnacht and injuring three others.

The target of the blast was the Army Mathematics Research Center, which only suffered minor damage in the bombing, while the most damage was to the university's physics department, where Fassnacht was working.

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Sterling Hall bombing

Sterling Hall bombing

The Army Mathematics Research Center was the target when Sterling Hall was bombed just after 3 a.m. on Aug. 24, 1970. The bombing killed a young physics researcher, Robert Fassnacht, and has often been labeled the death of the peace movement.

STATE JOURNAL ARCHIVES

Sterling Hall bombing

Sterling Hall bombing

Damage from the bombing of Sterling Hall on the University of Wisconsin campus is shown in August 1970. Despite an attempt to detonate the bomb when the building was vacant, a physics researcher conducting research unrelated to the Army Math Research Center was killed in the explosion. The impact of Robert Fassnacht's death brought a sudden halt to the violence to which anti-war protesters and police had resorted.

WISCONSIN HISTORICAL SOCIETY - ID#28381

Death in bombing

Death in bombing

Dane County police and Madison firefighters carry the body of Robert Fassnacht, 33, from UW-Madison's Sterling Hall after the graduate student was killed in a bombing targeting the Army Math Research Center, which was in that building.

CAPITAL TIMES ARCHIVES

Sterling Hall bombing

Sterling Hall bombing

Investigators comb through the wreckage of Sterling Hall after the August 1970 blast that tore it apart.

ED STEIN, STATE JOURNAL ARCHIVES

Robert Fassnacht

Robert Fassnacht

Robert E. Fassnacht was a grad student at UW Madison and working in Sterling Hall on August 24, 1970 when he was killed in the bombing there. 

STATE JOURNAL ARCHIVES

Sterling Hall bombing

Sterling Hall bombing

The Aug. 24, 1970, bombing of UW-Madison's Sterling Hall killed physicist Robert Fassnacht, who was working on research in the basement of the building when a massive truck bomb went off outside. 

State Journal archives

Sterling Hall bombing

Sterling Hall bombing

The aftermath of the Sterling Hall bombing.

Sterling Hall interior

Sterling Hall interior

The interior of Sterling Hall was heavily damaged in the bombing.

BRUCE FRITZ, STATE JOURNAL ARCHIVES

Sterling Hall bombing on front page

Sterling Hall bombing on front page

Front page of the State Journal, the day after the bombing of Sterling Hall.

Sterling Hall bombing suspects

Sterling Hall bombing suspects

Wanted in the Aug. 24, 1970, bombing of Sterling Hall were: David Fine, top left; Karleton Armstrong, top right; Dwight Armstrong, bottom left and Leo Burt.

FBI

Sterling Hall bombers caught

Sterling Hall bombers caught

Three of the Sterling Hall bombers - (from left) Dwight Armstrong, his brother Karl Armstrong, and David Fine - were caught years after the attack. A fourth co-conspirator, Leo Burt, was never caught.

File photos

Leo Burt

Leo Burt

Leo Burt dropped off the FBI's 10 Most Wanted List a few years after the 1970 bombing of UW-Madison's Sterling Hall.

FBI

Leo Burt, then and now

Leo Burt, then and now

In 2010, the FBI circulated new images of what fugitive Leo Burt might look like today, alongside a 1969 photo from his UW-Madison days. 

FBI

Engine fragment

Engine fragment

An engine fragment from the van used in the Sterling Hall bombing at the Wisconsin Historical Society.

STEVE APPS, STATE JOURNAL

Sterling Hall plaque

Sterling Hall plaque

A plaque mounted on Sterling Hall in memory of Robert Fassnacht, who was killed in a bombing at Sterling Hall in 1970.

STEVE APPS, STATE JOURNAL

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