caption: The image shows a map of the British Empire in the 19th century, depicting the route of the Battle of the Somme. It is a detailed map, showing the various cities, towns, and other geographical features of the area. The map is filled with intricate details, such as rivers, mountains, and cities, as well as labels for each city and town. The colors used are mostly shades of blue, green, and yellow, giving the map a vibrant and lively feel.