Websites for further research
http://www.pinetreeweb.com/13th-balaclava2.htm has a thorough discussion - and some illustrations - about the part played by the 13th Hussars in the Charge.
http://www.uea.ac.uk/edu/learn/braysher/charge.htm contains extracts from the Times correspondent, William Russell, describing the Charge.
http://www.bbc.co.uk/arts/poetry/outloud/tennyson.shtml has a recording of Lord Tennyson reading his own poem.
http://www.blacksea-crimea.com/WebAlbums/Balaklava-album/index.html has some of Roger Fenton's photographs from the Crimean War.
http://news.bbc.co.uk/2/hi/uk_news/magazine/3944699.stm carries a story on why the charge of the Light Brigade still matters, 150 years after it happened.