The Young Rebels - Season 1 Episode 6 Suicide Squad

Entrusted to deliver highly sensitive documents directly to Commanding General Washington, Jeremy and Elizabeth pose as a married couple delivering supplies to the troops at Valley Forge. To help guard the documents, they are accompanied by Henry and Isak. While reroute, they learn that the British have deployed ten specially trained killers to assassinate Washington, and that one of them may be one of the travelers they picked up along the road, in which case they will be delivering him directly to his target.