‘The Land Ironclads’ by HG Wells
An odd one, this. I was initially put off by the introduction which quotes Wells to the effect that he was a genius for inventing tanks and could have won the First World War single-handedly, if only he had been given a chance. This made me fear for story that wedded a remarkably casual attitude to warfare to a dryly technical account of the imaginary invention. You get quite a bit of both – the final section is simply a detailed description of the land ironclad – but it is also strangely told fable that at times seems starkly Victorian and at times resembles the New Wave SF of the Sixties. Weird.