Stop by the Senate House grounds on Friday, July 18, from 2 pm to 4 pm, to learn all about spies! Spies were very important during the Revolutionary War as they kept armies informed about the plans of the enemy. Site staff will host a craft table on our grounds where visitors will get a chance to learn a bit about spies and write a message in sympathetic stain (known today as invisible ink). Writing messages this way allowed rebel spies to communicate with each other without fear of sensitive information being intercepted. This family friendly drop-in activity is free and weather dependent.