Stephens escapes from Richmond. Foolish statements are attributed to the Queen, the Marquis, and Lord Wodehouse. The attempt to recapture him is ridiculed: "But one thing you'll not do, That is get from 'Parley-voo', The bird that thither flew"
The Fenians were an organization devoted to freeing Ireland. The organization was founded in 1858 by James Stephens, and quickly spread; the British government felt the need to suppress the group in 1865. Stephens and others were taken prisoner; although he escaped, it turned him cautious; he no longer had the nerve to take aggressive action. That pretty well killed the group as an active set of rebels; their attempt at an Irish rebellion failed in 1867.
For more on Stephens, see the notes to "James Stephens, the Gallant Fenian Boy." - RBW
Broadside Harding B 18(151): H. De Marsan dating per _Studying Nineteenth-Century Popular Song_ by Paul Charosh in American Music, Winter 1997, Vol 15.4, Table 1, available at FindArticles site. - BS