This interactive D3.js v7 visualization recreates Minard’s classic flow map of Napoleon’s 1812 Russian campaign, showing the shrinking army as a colored path whose width encodes troop counts and whose color distinguishes advance from retreat. A lower temperature chart plots the dropping Réaumur readings with dashed connecting lines back to the map. The code uses `d3.csvParse` to load embedded troop, temperature, city, and river data, then renders SVG paths with `d3.group` and `.selectAll().data()` for dynamic annotations and tooltips.