Redan is a feature of fortifications. It is a work in a V-shaped salient angle towards an expected attack. It can be made from earthworks or other material.
Saint Anthony's Battery in Qala, Malta, with a redan containing the entrance
"Cascalho" Redan in the city walls of Elvas, Portugal
The Battle of Borodino or the Battle of the Moskva took place on the outskirts of Moscow near the village of Borodino on 7 September 1812, during Napoleon's invasion of Russia. The Grande Armée fought
Redan
…of the 18th century. Surviving batteries with redans include Mistra Battery and Saint Anthony's Battery. The Russians used redans on their left at the Battle of Borodino against Napoleon. A small redan whose faces make an obtuse angle with a vertex toward the enemy is called a flèche (arrow in French). The Bagration…
The Battle of the Moskva Louis-François Lejeune, 1822
Napoleon I on the Borodino Heights, by Vasily Vereshchagin (1897)
Battle of Borodino by Peter von Hess, 1843. In the center it shows Bagration after being wounded.