Limited Edition Castle Stamp: Maruoka Castle Warrior Stamp: Shigeji Honda The phrase "A single brushstroke: Beware of fire, don't make Osen cry, fatten the horses" is said to be from a letter Shigeji wrote to his wife from the battlefield of the Battle of Nagashino in 1575, and is famous as the shortest letter in Japan. "Osen" refers to his young heir, Senchiyo (Narushige) at the time.