As many of us have long argued, the Wall's "state of the art" 13th century technology is easily defeated by the 14th's century invention of a ladder.

As many of us have long argued, the Wall's "state of the art" 13th century technology is easily defeated by the 14th's century invention of a ladder. https://t.co/2oLjtKOhZf

— Ronald Klain (@RonaldKlain) December 4, 2019