This scene, with its crowded composition and striking sense of movement, depicts the siege of the Celtiberian city of Numancia (Soria) by the forces of the Roman general Scipio (133 BC). It shows cavalry troops engaged in combat, with a city in flames in the background. Born in Granada, Moyano became a priest in 1747.

Within the sculptural programme commissioned by Ferdinand VI to decorate the New Royal Palace in Madrid were thirty-six reliefs or medallions (of an initially proposed forty-six), most of them sculpted in Badajoz marble and intended for the overdoors of the principal gallery. The iconographic programme was devised by the Benedictine scholar and monk Martin Sarmiento (1695-1772). The subjects depicted included religious ones intended as examples of good behavior; scientific ones aimed at promoting knowledge; political institutions, symbolizing good government; and military victories, representing heroism. This ornamental scheme was approved by the monarch in 1748 and begun in 1753 with the participation of the leading court sculptors. In 176o, however, Charles III decided that the reliefs were too elaborate and some of them remained unfinished or barely roughed out. Thirty-one of them entered the Museo del Prado in 1862, of which six were subsequently sent to the Real Academia de Bellas Artes de San Fernando in Madrid.