July 22, 1916 was hot.
As members of the Grand Army of the Republic assembled at the Ferry Building, awaiting the start of San Francisco's lavish Preparedness Day parade, one elderly veteran fainted. Just as an ambulance reached the fallen man, a explosion shook Market Street.
When the dust settled, a bloody scene painted the street. The sidewalks ran red and "all around the bodies of men and women, almost stripped of their clothes, lay in horrible grotesque heaps," wrote the Chronicle. Windows blocks away were shattered. Ten were dead, including one child, and another 40 injured.
It remains the only terrorist attack in San Francisco history.
