He fought at Pombal and at Redinha, and that so strenuously that, had it not been for Trant, Wilson, and other partisans who defended all the fords and bridges, Massena would have been able to have crossed the Mondego.

Wellington however turned, one by one, the positions occupied by Ney; and Massena, believing that the force at Coimbra was far stronger than it really was, changed his plans and took up a position at Cazal Nova.
Here he left Ney and marched for Miranda but, although Ney covered the movement with admirable skill, disputing every ridge and post of vantage, the British pressed forward so hotly that Massena was obliged to destroy all his baggage and ammunition.

Ney rashly remained on the east side of the river Cerra, in front of the village of Foz d'Aronce and, being attacked suddenly, was driven across the river with a loss of 500 men; many being drowned by missing the fords, and others crushed to death in the passage.
However, Ney held the line of the river, blew up the bridge, and his division withdrew in good order.
Massena tarnished the reputation, gained by the manner in which he had drawn off his army from its dangerous position, by the ruthless spirit with which the operation was conducted; covering his retreat by burning every village through which he passed, and even ordering the town of Leiria to be destroyed, although altogether out of the line he was following.
After this fight the British pursuit slackened somewhat, for Wellington received the news of the surrender of Badajoz and, seeing that Portugal was thus open to invasion by Soult, on the south, despatched Cole's division to join that of Beresford; although this left him inferior in force to the army he was pursuing.

The advance was retarded by the necessity of making bridges across the Cerra, which was now in flood, and the delay enabled Massena to fall back unmolested to Guarda; where he intended to halt, and then to move to Coria, whence he could have marched to the Tagus, effected a junction with Soult, and be in a position to advance again upon Lisbon, with a larger force than ever.

He had, however, throughout been thwarted by the factious disobedience of his lieutenants Ney, Regnier, Brouet, Montbrun, and Junot; and this feeling now broke into open disobedience and, while Ney absolutely defied his authority, the others were so disobedient that fierce and angry personal altercations took place.
Massena removed Ney from his command.