On October 25, 1590 he landed in Nantes (Brittany), with his army.
He established as an operational base the port of Blavet (now Port-Louis).
At the end of the year he began the fortification of the city undertaken by Cristóbal de Rojas, who built the magnificent " Fuerte del Águila (Águila Fort), named after the camp master.

On November 21, 1591 he took the castle of Blain.
On May 21, 1592 he defeated an Anglo-French army in Craon and, after chasing the English contingent, he completely derailed it in Ambrières.
On 6 November of that year he took Brest.

In 1593 part of the Juan del Águila army landed on Camaret and built "La Pointe des Espagnols" (The Tip of the Spaniards) fort in the Crozon peninsula, dominating the entrance to the Brest port.
In September 1594 he failed to relieve the town of Morlaix under siege which led to bitter tensions between himself and the Duke of Mercour.
On October 1st, an Anglo-French army started a siege of Fort Crozon, while an English fleet bombarded the place from the sea.
The garrison could only hold out until November 15, while the auxiliary army, led by Juan del Águila, failed to relieve the fort having been blocked at Plomodiern.
On the 19th an assault by the besiegers put the garrison to the sword - there were only thirteen survivors.
On October 25, 1590 he landed in Nantes (Brittany), with his army. He established as an operational base the port of Blavet (now Port-Louis). At the end of the year he began the fortification of the city undertaken by Cristóbal de Rojas, who built the magnificent " Fuerte del Águila (Águila Fort), named after the camp master.
On November 21, 1591 he took the castle of Blain. On May 21, 1592 he defeated an Anglo-French army in Craon and, after chasing the English contingent, he completely derailed it in Ambrières. On 6 November of that year he took Brest.
In 1593 part of the Juan del Águila army landed on Camaret and built "La Pointe des Espagnols" (The Tip of the Spaniards) fort in the Crozon peninsula, dominating the entrance to the Brest port. In September 1594 he failed to relieve the town of Morlaix under siege which led to bitter tensions between himself and the Duke of Mercour. On October 1st, an Anglo-French army started a siege of Fort Crozon, while an English fleet bombarded the place from the sea. The garrison could only hold out until November 15, while the auxiliary army, led by Juan del Águila, failed to relieve the fort having been blocked at Plomodiern. On the 19th an assault by the besiegers put the garrison to the sword - there were only thirteen survivors.
Juan del Águila