Guerra de las Naranjas
Benito de San Juan started his military career as a Lieutenant Colonel of the hussars of Estremadura during the War of the Oranges (1801). Noticed by Manuel Godoy, he was promoted to colonel and in 1802 was named commander of Godoy's personal guard. He was promoted to Brigadier followed by his promotion in 1805 to the rank of "Mariscal" (field marshal). He then became general inspector of Spanish infantry and line cavalry.