La Gazza Ladra

This title is an acquisition.

To celebrate a treaty peace, three kings decide to wage war against the birds of the forest, killing a great number of them, but a magpie decides to seek revenge for its dead companions and attacks the three kings, until they are forced to seek refuge in their castle. But the magpie, calling to all the surviving birds, demolishes the castle until only the skeleton remains, similar to a cage, where the kings and their soldiers are forced to remain as prisoners.