Reminiscent of the Peterloo Massacre of 1819, in which a cavalry charge into a crowd killed eleven people and injured over 400 others, including many women and children. Local magistrates had been afraid the meeting organised by people asking for repeal of the Corn Laws (which had led to high bread prices) would turn into a riot, and prematurely sent in the cavalry — led by a nincompoop — with drawn sabres to break up the meeting.
Terry says:
“It was Peterloo that I had in mind, as discussed here some time ago. But as a general rule, when things look bad there’s always some dickhead who can make them worse.”