This chapter compares work done by Hugh Hamshaw Thomas in two domains. First, in palaeobotany; second, in military intelligence in the First and Second World Wars. In each, Thomas investigated landscape processes using fragmentary visual evidence: plant evolution from fossils, enemy behaviour from aerial photographs. I propose we understand the connection between those domains by drawing together two, largely separate, scholarly discussions: (i) on the construction and evidential use of photographic archives; (ii) on evidence and causal explanations in the historical sciences. Through analysis of Thomas's palaeobotanical and military work I situate narrative as the central and unifying principle of a practice in which neither evidence collection nor explanatory accounts were prior. This unifying 'narrative practice' was reticulate, multi-scalar and dynamic, as revealed by contemporary figures of speech that sought to describe it (working 'like Sherlock Holmes', 'reading the book of nature', thinking 'like a river').
9.1