Reynier’s feints meanwhile had given Hill some trouble; the appearance of a northward move on the part of his adversary had caused the British general to make ready for a parallel march on Fundão and Guarda, so as to connect himself with his chief. He transferred his head quarters first from Castello Branco to Sarzedas, and then from Sarzedas to Atalaya, at the foot of the pass that leads to the Mondego valley, intending to cross the mountains the moment that Reynier had passed over the Perales defiles with his main body. But seeing the 2nd Corps unexpectedly turning back and concentrating at Zarza, Hill also retraced his steps, and lay at Sarzedas again from August 3rd till September 21st, with his advanced guard at Castello Branco and his cavalry well out to the front along the Spanish frontier, watching every movement of the 2nd Corps. During this time of waiting the Portuguese cavalry of his division had two small but successful engagements with Reynier’s horse, of whom they cut up a squadron on the 3rd of August near Penamacor and another on the 22nd at Ladoeiro, when two officers and sixty men of the Hanoverian _Chasseurs à Cheval_ were killed or taken[313]. [313] For details of this combat see Foy’s observations on p. 97 of his _Vie Militaire_, ed. Girod de L’Ain. Wellington’s doubts as to Masséna’s intentions in the first days of August were provoked not merely by the movements of the 2nd Corps, but by a demonstration made on an entirely new front by General Serras, the officer who had been left with an unattached division to hold the plains of Leon, when Junot and the 8th Corps went off to join the main army on the Agueda. In obedience to Masséna’s orders, on July 27 Serras collected at Benavente as much of his division as could be spared from garrison duty, and moved forward to threaten the frontier of the Tras-os-Montes, far to the north of Portugal. He advanced with some 5,000 men as far as Puebla de Senabria, from which on July 29 he drove out a small Spanish force under General Taboada--the weak brigade which Echevarria had formerly commanded. Silveira immediately collected all the Portuguese militia of his district at Braganza, and prepared to defend the frontier. But Serras unexpectedly turned back, left a battalion of the 2nd Swiss Regiment and a squadron of horse in Puebla de Senabria, and returned to Zamora. The moment that he was gone Silveira and Taboada united their forces, attacked this small detached force, routed it, and shut it up in the town on August 4. It was forced to surrender some six days later, about 20 officers and 350 men, all that remained of 600, being made prisoners. Serras, who had hurried back when he heard of Silveira’s offensive movement, was too late by twelve hours to save his men, and found Puebla de Senabria empty, for the allies had gone off with their prisoners and taken to the mountains. He then retired to Benavente, and Taboada reoccupied Puebla de Senabria,