Progressive Casualty Insurance Company and affiliates not available in all states or situations. Coverage subject to policy terms. The History Channel, original podcast. History this week, July 26th, 1775. I'm Sally Helm. The Rebel headquarters in Cambridge, Massachusetts. Inside this stately Georgian mansion, major generals hole up in makeshift bedrooms and cooks playing pots and pans, trying to feed an army. The dining room, meanwhile, has been converted into a war room. And in it, a 43-year-old George Washington is set to conduct a very unassuming act of war. He pulls out a chair, sits down at a table, takes out a piece of paper, and starts to write. Washington has just arrived in Massachusetts, the brand new commander-in-chief of a rebel army, which, at this moment, in July of 1775, is losing. They're fresh off a defeat at Bunker Hill. The Redcoats now control the city of Boston, just across the river. But the colonists are actually feeling optimistic. Bunker Hill was a loss, but a close one. They are outfunded, outmanned, outgunned. But maybe they can win this thing. And what Washington doesn't know is that he's about to get a brand new military advantage. As he sits at that dining room table, he scratches down his orders for the day. In this case, instructions to build barracks that will keep people warm when winter eventually comes. And he sends them off to his troops. And this simple act, communicating by letter, it is actually an important, unheralded part of warfare. If you can't communicate, you just can't win. And luckily for George Washington, on this very day, the rebel Congress in Philadelphia is appointing a different general, a new postmaster general, Benjamin Franklin. Today, Benjamin Franklin revolutionizes the postal system. How did this founding father shape America's postal service? And how did that effort help the rebels win the war? More than 50 years earlier, 1723, a small boat rose into Pennsylvania's Market Street Wharf. The rowers look a little worse for wear, kind of rumbled, like they've slept on a riverbank,