In the Castle Siege of "Where's Waldo: The Incredible Paper Chase", the key is located on the middle left side of the scene, above the towers and below the flying balloon. Look closely among the chaos of the battle to find the key!
Siege of Iwaya Castle happened in 1586.
Siege of Kōzuki Castle happened in 1578.
Siege of Toda Castle happened in 1543.
Siege of Ichijōdani Castle happened in 1573.
Siege of Carrigafoyle Castle happened in 1580.
Siege of Ōta Castle happened in 1585.
Siege of Noda Castle happened in 1573.
Siege of Hikida Castle happened in 1573.
Siege of Iwamura Castle happened in 1572.
Siege of Odani Castle happened in 1573.
Siege of Roxburgh Castle happened in 1313.