Question

why is a deep ditch dug along the wall of the fort​

Answer 1

Explanation:

it prevents the enemies to reach to the top of the fort. it is also known as dry moat

Answer 2

Explanation:

The deep ditch dugs along the wall of the fort are used as the protectors as this prevents the attacking ladder from getting high enough to reach the top of the walls that provided protection. Also, during a siege, attackers usually cannot reach close enough to the walls to measure depth so that they can build a ladder sufficiently to reach. This deep ditch dug protects the fort outside attackers.