This interactive D3.js visualization recreates Charles Joseph Minard’s 1869 flow map of Napoleon’s 1812 Russian campaign, depicting troop strength as path width across geography, with a linked temperature chart showing the freezing retreat conditions. Hovering over army paths and temperature points reveals detailed tooltips, while city markers, river lines, and annotations highlight key events such as the Berezina crossing. The SVG rendering uses `d3.csvParse` for embedded data, `d3.group` for path segmentation by troop group and direction, and D3 scales to map longitude/latitude coordinates alongside the temperature time series.