Of all the causes for the War of 1812, the impressment of American sailors into the Royal Navy was the most important for many Americans. The British practice of manning naval ships with "pressed" men, who were forcibly placed into service, was a common one in English history, dating back to medieval times.
Leapard and Cheespeate
The Chesapeake–Leopard Affair was a naval engagement that occurred off the coast of Norfolk, Virginia, on 22 June 1807, between the British warship HMS Leopard and the American frigate USS Chesapeake. The crew of Leopard pursued, attacked, and boarded the American frigate, looking for deserters from the Royal Navy.