[See Sorauren Part 1] After the battle on the 28th Soult worked on plans to hit the British but still be able to extricate his army. Wellington prepared to attack. Soult announced that he was going to relieve San Sebastian and ordered the difficult manoeuvre of marching across the front of the British army over night. The summer night was not long enough and dawn showed three division of French crossing the hillside within cannon range. The guns opened up immediately and soon after the British line moved forward. Foy's division was cut off from the rest of the French army and he ordered a retreat over the pass of Roncesvalles. During this march Foy collected so many men that his 'division' doubled in size.
The remainder of Soult's army conducted a fighting breakout, lead by units of d'Erlon's corps. In spite of good generalship and determined fighting by British, Portugese and Spanish soldiers Wellington could just not get enough men in the right place to prevent Soult using the Bidassoa gorge and reaching French soil.
Numbers involved and casualties are totals for the three days. [see Soraureen 1]

Along the route from the village of Sorauren 5 miles north east of Pamplona, Spain to the Bidassoa Gorge. (Spain)

French Army of Spain [Soult]

Number engaged :

60,000

Casualties :

13,251 (22.09%)

British Peninsular Army

Number engaged :

35,300

Casualties :

4,125 (11.69%)