Qualla: Alton Military Prison

Alton Military Prison: Introduction

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Jonathunder, Public domain. The building was already a ruin when the war began. Illinois had opened its first state penitentiary in Alton in 1833, but by 1860 the prison was so decrepit that the state had abandoned it for a new facility in Joliet. Then the Civil War arrived, the Union suddenly needed places to hold thousands of Confederate prisoners, and the abandoned penitentiary in Alton got a second life that no one would have wished for. Over the next three years, more than 11,000 Confederate soldiers passed through its crumbling walls. At least 1,534 of them died there -- not from battle wounds, but from smallpox, typhoid, dysentery, and pneumonia. Today, only a section of wall remains, standing on the Alton riverfront as a memorial to suffering that happened not on a battlefield but in a building the state had already condemned.

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Image: Jonathunder | Public domain

Alton Military Prison: A Prison Already Condemned

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Nyttend, Public domain. When Illinois built its first state penitentiary in Alton in 1833, the Mississippi River town was a logical choice -- accessible by water, close to the growing population centers of the American Bottom. For nearly three decades, the prison held the state's convicted criminals beh...

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Image: Nyttend | Public domain

Alton Military Prison: The Smallpox Island

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Nyttend, Public domain. Conditions inside the Alton prison were catastrophic from the start. The facility designed to hold several hundred state prisoners was packed with thousands of Confederate POWs. Overcrowding made disease inevitable, and when smallpox broke out in 1862, it tore through the populat...

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Image: Nyttend | Public domain

Alton Military Prison: A War Within the War

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Nyttend, Public domain. The Alton prison held more than just Confederate soldiers. The facility also confined civilian political prisoners, including Confederate sympathizers from Missouri and southern Illinois who were detained without trial under wartime emergency powers. The prison's proximity to the...

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Image: Nyttend | Public domain

Alton Military Prison: One Wall Remaining

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Nyttend, Public domain. When the Civil War ended, the Alton prison was abandoned for a second and final time. The buildings were demolished over the following decades as Alton expanded. Today, only a section of the original limestone wall survives, standing along the riverfront near the intersection of ...

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Image: Nyttend | Public domain