This August 7, 1864 photograph captures a bombproof shelter on the Union advance line at Petersburg, where soldiers endured months of trench warfare that foreshadowed World War I. Constant mortar fire and sniper shots forced men underground into cramped, clay‑walled bunkers reinforced with timber and earth.
The Siege of Petersburg transformed the Civil War from sweeping battlefield maneuvers into a static, psychological grind of mud, claustrophobia, and survival beneath the soil.
via NYPL, no known restrictions
