Here's what you need to know about the walls of Jericho: They were huge. They encircled the city like armor, two concentric stone circles that rose a total of 12.19 meters above ground level. Impenetrable.
Here's what you need to know about the people of Jericho: They were fierce and cruel. They resisted all sieges and repulsed all invaders. They were guilty of sacrificing children. "They even burn their own children on their altars!" (Dt 12.31 tla). They were the Gestapo in a Bronze Age version, ruthless tyrants in the valleys of Canaan.
Until the day Joshua showed up. Until the day his army was launched. Until the day the bricks cracked and the rocks broke. Until the day when everything shook ... the stones of the walls, the knees of the king and the teeth of the soldiers. The impenetrable fort ran into the unstoppable force. Mighty Jericho crumbled.