Advantage Over The Enemy
Having only space for one person to enter at a time, ensured that if any invaders discovered the caves, they would be killed one at a time. This also guaranteed that the attackers could not launch a full blown attack.
Come And Get Me
Let’s say the attack force did find the secret hideout. Their next task would be attempting to gain entry. The masterminds behind the fortress’ architecture implemented a brilliant and well-weighted plan. At each of the openings, a massive boulder was placed to cover the hole. Even more impressively, the boulders could only be removed from the inside and it was almost impossible to dislodge them from outside.