S1, E4: As a spy for the Uesugi forces, Sasuke has been spying on the Oda Forces looking for a way to bring them down for his master. One of his suggestions is the idea of junk or spam mail, basically in an attempt to annoy Nobunaga and his men. The men write hundreds of letters and shoot them off, greatly underestimating the kind of men Nobunaga has in his service.