I know the song you mean, although I haven't got the words. I'll see if I can get them at the pub tonight. I think the story is about the corn laws and a general demonstration objecting to them. Ordinary people were charged by cavalry in 18 hundred and something, resulting in the 'Peterloo Massacre'. I've got some bumph on it at home which I'll dig out and post tomorrow for you. Cheers, John