The word Battlement is the collective term used to describe several parts of a defensive castle wall that are needed to make up the “battlement”
The battlements are usually placed on top of the outer main castle walls at the entrance but can be added to any part of a castle’s main walls, including towers.
This is the main part of the Battlement the low stone wall that Crenels (gaps) and Merlons (solid parts)
Crenels were simply the gaps that were usually a square or rectangular shape in the Battlement parapet (wall). Crenels were usually spaced at regular intervals either when building the Parapet (wall) or added later, this act of adding Crenels to a previously unbroken wall was called Crenellation.
Crenels are also sometimes called carnels or embrasures – Crenels usually had a defensive purpose but were also sometimes added for decorative purposes.
Melons were the solid parts of the wall, crenels were the gaps.
A Castle Battlement can be described as being an additional defensive stone wall that was built at the top of a castle’s main wall. The Castle Battlement served several purposes, to defend the castle’s military and at the same time gaps in the wall allowed archers to fire arrows, and other military defending the castle could drop objects on the enemy below.
The Battlement Parapet (wall) was commonly built around the chest, shoulder, or head height to help protect the defenders of the castles from enemy fire, the cutouts in the castle Parapet were called Crenels and were usually square or rectangular and allowed archers to fire their arrows at the enemy, they could then re-load safely behind the higher part of the parapet wall.
Castle battlements were defensive walls that were built on the top of a castles main outer walls for defensive reasons and allowed castles military to defend the castle against castle sieges and attacks. A battlement also describes a defensive city wall made from stone that often surrounded a medieval town.
The decline of medieval Castle battlements and the decline of castles themselves can be attributed to the advancement of medieval weaponry, in particular Cannons. These new gunpowder weapons and the start of the age of enlightenment which was called the “Renaissance period” led to the decline of medieval castles and medieval castle battlements were no longer required.