We Are One: During the British occupation of Boston, Lieutenant William Pierie of the Royal Artillery drew this map of the city and the surrounding landscapes. Surveys like these provided the British with information about the geography of North America. Engravings of Pierie’s scenes appeared in The Atlantic Neptune, a maritime atlas used by the British Navy during the Revolutionary War. Pierie depicted geographical features that proved strategically important during the siege of Boston. George Washington’s soldiers, for example, would build fortifications on Dorchester Heights that helped force the British to evacuate.