During the American Revolutionary War, New Jersey was a strategic location between New York City, and the Continental Congress in Philadelphia. Important materials necessary to the war effort were produced in North Jersey. The Continental Army made its home here during the war, and history from this period can be found in nearly every village and town in North Jersey. Battle fields, camps, skirmish sites, and headquarters can be found near Morristown and north in the Preakness Valley. In the northwestern part of the state, iron mines and foundries supplied raw material for guns and ammunition.