What type of pistol did Rose O'Neal Greenhow have when she was arrested?

Dear Mr. Webster,

Thank you for posting your request on History Hub!

The details of her imprisonment that you seek may be included in her book “My Imprisonment and the First Year of Abolition Rule at Washington” or in her correspondence. For more information, please contact the National Archives at Washington, DC (RDT1) via email at archives1reference@nara.gov.

A description about the Old Capitol Prison or NARA’s web page about Greenhow does not reveal that detail.

We hope this information is helpful. Best of luck with your research!