What was added to the tops of towers in order to provide stone shields for more effective defense?

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Quizplus · Accepted Answer

Crenellations, also known as battlements, were added to the tops of towers to provide stone shields for more effective defense. They consist of alternating solid portions of wall (called merlons) and gaps (called embrasures) that allow defenders to shoot arrows or drop projectiles while providing cover.

What Was Added to the Tops of Towers in Order