This interactive data visualization recreates Minard's famous map of Napoleon's 1812 Russian campaign, showing the army's advance and retreat as colored paths whose thickness scales with troop count. A separate temperature chart aligns below the map by longitude, displaying readings with dates, while city labels mark key locations. Built with React and D3.js (v7), the code uses `d3.scaleLinear` and `d3.scaleSqrt` for coordinates and line width, `d3.line` for path generation, and `d3.csv` to load troop, temperature, and city data from CSV files.