At the beginning of the War of the Pyrenees, Spanish government decided to attack in the eastern Pyrenees while holding in the west.
The Spanish had 8,000 regulars and between 9,000 and 10,000 militia in Navarre and Gipuzkoa, while from 4,000 to 5,000 troops held Aragon.
The Spanish commander in the west, Ventura Caro y Fontes mounted a quick offensive across the lower Bidasoa River near Hendaye.
The French volunteers panicked and ran away, allowing their opponents to capture the Camp de Jolimont by 30 April 1793.
For this defeat, the French general Joseph Duverger was arrested and sent to Paris.
Servan pulled his troops behind the Nivelle River with his right wing at Bidart.
While awaiting reinforcements behind a screen of regular and reliable volunteer units, the French commander began drilling his conscripts and raw volunteers.
Massing the army's grenadier companies into one body under Theophile Corret de la Tour d'Auvergne, Servan sent them to recapture Saint-Pée-sur-Nivelle.
This move was followed by a tentative advance in May.
On 27 May 1793 Servan sent a force under Pierre François Lambert Lamoureux de Genettière to threaten the Roncevaux Pass.
Caro sent a column under Pedro Caro, 3rd Marquis of la Romana to counter the French.
On 6 June the two sides clashed at Chateau-Pignon.
At first Moncey with Jean Boudet, the 5th Light Infantry and few other units did well but superior Spanish forces soon forced them back on the main body.
After a few rounds of artillery fire, the untried French volunteers fled leaving Genettière to be captured.
La Romana's soldiers then successfully stormed Chateau-Pignon.
On 22 June Servan pushed the Spanish left wing back to the Bidasoa, capturing the Montaigne Louis XIV redoubt.
On 30 August, Deprez-Crassier ordered a major assault on the Spanish outpost of Biriatou.
La Romana not only repelled the assault but drove the attackers back to the Sans Culottes Camp near Urrugne.
On the same day, José Urrutia y de las Casas repulsed a second column under Willot in its attack on Bera (Vera).

On 5 February 1794 in the Battle of Sans Culottes Camp, Frégeville successfully defended the camp against 13,700 Spanish troops led by Urrutia.
On 3 June, a 2,300-man French brigade led by Lavictoire, part of Mauco's division, stormed the Izpegi Pass.
The 1,000 defenders included Spanish and French royalist soldiers.
The same day, Jacques Lefranc seized the Izpegi Ridge and other French troops captured positions near the Maya Pass.
On 23 June Ventura Caro's 8,500 Spanish soldiers were repulsed by a French force defending the fortified Mont Calvaire.
On 10 July Antoine Digonet's 4,000-strong brigade drove the Spanish and French Royalists from their defenses atop Monte Argintzo (Arquinzu).
The French massacred 49 captured French Royalist prisoners while Marquis de Saint-Simon escaped, though badly wounded.

On 23 July the Army of the Western Pyrenees opened the Battle of the Baztan Valley by attacking the Spanish with the three front-line divisions of Moncey, Delaborde and Frégeville.
The French enjoyed a numerical superiority of 30,000 to 20,000 over their adversaries.
Moncey began marching over the Maya Pass with 10,000 troops on 24 July and invaded the Baztan Valley the next day.
Delaborde with 6,000 men thrust south to seize Bera on the 25th.
Moncey started from Elizondo with 6,000 and rendezvoused with Delaborde at Lesaka.
The combined column then moved to support 6,000 soldiers under Frégeville attacking across the lower Bidasoa on 1 August.
Aware that the French had gained their rear, the Spanish defenders quickly abandoned the fortress of Hondarribia (Fuenterrabia).
Vicente de los Reyes surrendered with 2,000 Spanish soldiers and 300 cannon.
On 3 August San Sebastián and 1,700 more Spanish soldiers plus 90 cannons fell into French hands.
On this occasion Moncey sent La Tour d'Auvergne-Corret to overawe the Spanish commander.
As a final touch, Frégeville occupied Tolosa on 5 August.

Moncey gained another victory in the Battle of Orbaizeta on 15–17 October 1794.
Frégeville advanced toward Lekunberri whil
At the beginning of the War of the Pyrenees, Spanish government decided to attack in the eastern Pyrenees while holding in the west. The Spanish had 8,000 regulars and between 9,000 and 10,000 militia in Navarre and Gipuzkoa, while from 4,000 to 5,000 troops held Aragon. The Spanish commander in the west, Ventura Caro y Fontes mounted a quick offensive across the lower Bidasoa River near Hendaye. The French volunteers panicked and ran away, allowing their opponents to capture the Camp de Jolimont by 30 April 1793. For this defeat, the French general Joseph Duverger was arrested and sent to Paris. Servan pulled his troops behind the Nivelle River with his right wing at Bidart. While awaiting reinforcements behind a screen of regular and reliable volunteer units, the French commander began drilling his conscripts and raw volunteers. Massing the army's grenadier companies into one body under Theophile Corret de la Tour d'Auvergne, Servan sent them to recapture Saint-Pée-sur-Nivelle. This move was followed by a tentative advance in May.
On 27 May 1793 Servan sent a force under Pierre François Lambert Lamoureux de Genettière to threaten the Roncevaux Pass. Caro sent a column under Pedro Caro, 3rd Marquis of la Romana to counter the French. On 6 June the two sides clashed at Chateau-Pignon. At first Moncey with Jean Boudet, the 5th Light Infantry and few other units did well but superior Spanish forces soon forced them back on the main body. After a few rounds of artillery fire, the untried French volunteers fled leaving Genettière to be captured. La Romana's soldiers then successfully stormed Chateau-Pignon. On 22 June Servan pushed the Spanish left wing back to the Bidasoa, capturing the Montaigne Louis XIV redoubt. On 30 August, Deprez-Crassier ordered a major assault on the Spanish outpost of Biriatou. La Romana not only repelled the assault but drove the attackers back to the Sans Culottes Camp near Urrugne. On the same day, José Urrutia y de las Casas repulsed a second column under Willot in its attack on Bera (Vera).
On 5 February 1794 in the Battle of Sans Culottes Camp, Frégeville successfully defended the camp against 13,700 Spanish troops led by Urrutia. On 3 June, a 2,300-man French brigade led by Lavictoire, part of Mauco's division, stormed the Izpegi Pass. The 1,000 defenders included Spanish and French royalist soldiers. The same day, Jacques Lefranc seized the Izpegi Ridge and other French troops captured positions near the Maya Pass. On 23 June Ventura Caro's 8,500 Spanish soldiers were repulsed by a French force defending the fortified Mont Calvaire. On 10 July Antoine Digonet's 4,000-strong brigade drove the Spanish and French Royalists from their defenses atop Monte Argintzo (Arquinzu). The French massacred 49 captured French Royalist prisoners while Marquis de Saint-Simon escaped, though badly wounded.
On 23 July the Army of the Western Pyrenees opened the Battle of the Baztan Valley by attacking the Spanish with the three front-line divisions of Moncey, Delaborde and Frégeville. The French enjoyed a numerical superiority of 30,000 to 20,000 over their adversaries. Moncey began marching over the Maya Pass with 10,000 troops on 24 July and invaded the Baztan Valley the next day. Delaborde with 6,000 men thrust south to seize Bera on the 25th. Moncey started from Elizondo with 6,000 and rendezvoused with Delaborde at Lesaka. The combined column then moved to support 6,000 soldiers under Frégeville attacking across the lower Bidasoa on 1 August. Aware that the French had gained their rear, the Spanish defenders quickly abandoned the fortress of Hondarribia (Fuenterrabia). Vicente de los Reyes surrendered with 2,000 Spanish soldiers and 300 cannon. On 3 August San Sebastián and 1,700 more Spanish soldiers plus 90 cannons fell into French hands. On this occasion Moncey sent La Tour d'Auvergne-Corret to overawe the Spanish commander. As a final touch, Frégeville occupied Tolosa on 5 August.
Moncey gained another victory in the Battle of Orbaizeta on 15–17 October 1794. Frégeville advanced toward Lekunberri whil
Army of the Western Pyrenees