Mrs. McGrath, an Irish folk song set during the Peninsular War of the early 19th century. The song tells the story of a woman whose son enters the British Army and returns seven years later having lost his legs to a cannonball while fighting against Napoleon presumably at the Battle of Fuentes de Oñoro (fought between 3 and 5 May 1811). The general theme of the song is one of opposition to war.
I especially enjoy Springsteen's version because with his voice and the overall tone he imparts on the song is quite moving.