A protected embrasure (1) includes a firearm (10) having a barrel or cradle (11). The protected embrasure (1) has a body (20) and zenithal angle device or elevation angle device (21) of the firearm (10), which cause the firearm (10) to rotate around a rotation axis X, which is orthogonal to a firearm axis Y, which is defined by the length of the barrel or cradle (11). The elevation angle device (21) causes the firearm (10) to rotate by an elevation angle φ with respect to a horizontal direction. The embrasure includes a pair of protection plates (30, 50) mounted above the firearm (10); and a third protection plate (31) mounted under the firearm (10). The plates are oriented with respective faces lying on a plane having an axis that is parallel to the rotation axis X and orthogonal to the firearm axis Y.