In 1861, he became war correspondent for the New York Tribune, was wounded at Fort Donelson, and taken prisoner while engaged in an abortive expedition to run the Vicksburg batteries.
His list of Union soldiers who died at Salisbury, published in the Tribune, is the only authentic account of their fate.
His best-known works are Four Years in Secessia (1865), The Great Metropolis: A Mirror of New York (1869), and Sights and Sensations in Europe (1872).
His Four Years in Secessia has descriptions of various incidents of the American Civil War and information concerning the conditions of the Southern prisons and the Northern soldier confined in them.
In August 2013, a new book about Browne and Richardson, Junius and Albert's Adventures in the Confederacy by journalist and author Peter Carlson, was published by PublicAffairs.