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At the Institute’s core is the Gilder Lehrman Collection, one of the great archives in American history. More than 85,000 items cover five hundred years of American history, from Columbus’s 1493 letter describing the New World through the end of the twentieth century.

Unknown [General orders no. 29 regarding countersign signals]

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Gilder Lehrman Collection #: GLC06628.05 Author/Creator: Unknown Place Written: Washington, D.C. Type: Pamphlet Date: October 1861 Pagination: 7 p. ; 28.0 x 22.4 cm. Order a Copy

Issued by S. William and John Jones as Assistant Adjutant Generals at the headquarters of the Army of the Potomac. Includes specific instructions on both day and night countersign signals. Includes an unsigned handwritten note on the last page stating that this circular is to remain confidential, and that its contents are not to be made public. The note is missing text due to a large tear.

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