Battlements

A form of indented parapet around the top of castles and towers which may either be defensive or decorative. A Guelf battlement was rectangular while the solid upright blocks (merlons) of a Ghibelline battlement were further indented with a 'V' shape.
Found on http://www.encyclo.co.uk/local/21096

Battlements

Generic term for crenallations of timber and/or stone. They were added to buildings to give cover to defenders. Crenallating, the act of building crenallations, required a licence from the Monarch without which a castle was classed as unofficial (as for Nafferton, Northumberland). Loopholes could also be used to drop heavy items onto attackers from...
Found on http://www.encyclo.co.uk/local/20766

Battlements

parapet on top of a castle wall, with a series of gaps (embrasures or crenelles) between raised portions (merlons), allowing defenders to shoot through; also called crenellations
Found on http://www.encyclo.co.uk/local/22129

Battlements

parapet on top of a castle wall, with a series of gaps (embrasures or crenelles) between raised portions (merlons), allowing defenders to shoot through; also called crenellations
Found on https://www.encyclo.co.uk/local/20402
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