Likewise, the only documentation that refers to his nickname "El Pastor" ["The Shepherd"] as his profession, is based on the fact that cattle figure among the assets declared by his parents.

By May 1810, he had been promoted to lieutenant and at the end of that year, Francisco Espoz y Mina, commander-in-chief of the Corso Terrestre in Navarre, authorised him to set up the first Volunteer Battalion of Guipúzcoa.

[4] Popham's squadron included two line of battleships, five frigates and two sloops, carrying two battalions of marines, and a large number of small arms for the insurgents.

[4] In October 1812, he was promoted to colonel, at the head of the 1st, 2nd and 3rd Volunteer Battalions of Guipúzcoa, each with a notional number of 1,200 troops, and which formed part of Gabriel de Mendizábal's 7th Army.

[3] Following Rafael del Riego's January uprising, and Ferdinand's acceptance, in March, of the 1812 Constitution, thereby ushering in the so-called Liberal Triennium, Jáuregui took command of a militia unit, seeing action in several military operations.