Long Bridge, Lincoln's Time. Washington, DC. Union troops guarding a bridge over the Potomac River to Virginia to prevent infiltration by Confederate spies.

Full Citation: Long Bridge, Lincoln’s Time. Washington, DC. Union troops guarding a bridge over the Potomac River to Virginia to prevent infiltration by Confederate spies.; 1865; General Photographic File of the Commission of Fine Arts, ca. 1910 – 1950; Records of the Commission of Fine Arts, Record Group 66. [Online Version, https://docsteach.org/document/long-bridge-lincolns-time-washington-dc-union-troops-guarding-a-bridge-over-the-potomac-river-to-virginia-to-prevent-infiltration-by-confederate-spies/, April 10, 2026]