From the position where Terence was standing, the front of the steep slope that the French were climbing could not be seen but, almost at the same moment, a dense mass of men began to swarm up the hill on Donkin's flank; having, unperceived, made their way in at the mouth of the valley.

"Form up your battalion, Macwitty," he shouted, "and double down the hill."

Then he rode after Bull, whose battalion had now reached the valley and halted there.

"We must go to the assistance of the brigade on the hill, Bull, or they will be overpowered before reinforcements can reach them.

"Herrara, bring on Macwitty after us, as soon as he gets down.

"Take the battalion forward at the double, Bull."

The order was given and, with a cheer, the battalion set out across the valley and, on reaching the other side, began to climb the steep ascent; bearing towards their left, so as to reach the summit near the spot where the French were ascending. Twilight was already closing in, and the approach of the Portuguese was unobserved by the French, whose leading battalions had reached the top of the hill, and were pressing heavily on Donkin's weak brigade; which had, however, checked the advance of the French on their front. Macwitty's battalion was but a short distance behind when, marching straight along on the face of the hill, Bull arrived within a hundred yards of the French. Here Terence halted them for a minute, while they hastily formed up in line, and Macwitty came up.

The din on the top of the hill, just above Bull's right company, was prodigious, the rattle of musketry incessant, the exulting shouts of the French could be plainly heard; and their comrades behind were pressing hotly up the hill to join in the strife. There was plainly not a moment to be lost and, advancing to within fifty yards of the French battalions, struggling up the hill in confused masses, a tremendous volley was poured in.

The French, astonished at this sudden attack upon their flank, paused and endeavoured to form up, and wheel round to oppose a front to it; but the heavy fire of the Portuguese, and the broken nature of the ground, prevented their doing this and, ignorant of the strength of the force that had thus suddenly attacked them, they recoiled, keeping up an irregular fire; while the Portuguese, pouring in steady volleys, pressed upon them. In five minutes they gave way, and retired rapidly down the hill.

The leading battalions had gained the crest where, joining those who had ascended by the other face of the hill, they fell upon the already outnumbered defenders. Donkin's men, though fighting fiercely, were pressed back, and would have been driven from their position had not General Hill brought up the 29th and 48th, with a battalion of detachments composed of Sir John Moore's stragglers. These charged the French so furiously that they were unable to withstand the assault, although aided by fresh battalions ascending the front of the hill.