Terence at once sent Ryan with 200 men to reinforce Macwitty, and despatched several mounted messengers to find Bull, and to tell him to join him on the road, four miles to the east of the point where Macwitty was defending the passage of the river. He himself marched directly on that point, crossing the river at Tordesillas. He arrived there early in the morning, and found that the French column had passed, late the evening before. At this point the road ran between two hills, several times crossing a stream that wound along the valley. A large number of men were at once set to work, breaking down the bridges and throwing up a breastwork along the bank, where the river made a sharp bend, crossing the valley from the foot of the hills on one side to that of those on the other. While this work was being done cannon shots were heard, then a distant rattle of musketry. Terence knew that by this time Ryan would have joined Macwitty; and Moras at once started, with his men and 400 of the Portuguese, to threaten the French rear, and make a dash upon their baggage. Terence's orders to the officers in command of these two companies were that they were to keep their men well together, and to cover the retreat of the guerillas from cavalry attacks. The firing continued for the next hour and a half, then it suddenly swelled in volume, and amid the rattle could be heard the sound of heavy volleys of musketry. Terence had, half an hour before, ridden forward at full speed with four mounted orderlies. When he arrived at a spot where he could survey the scene of combat, he saw that it was more serious than he had anticipated. The guerillas were falling back rapidly, but as soon as they gained the high ground they halted and opened fire upon the cavalry who, scattered over the plain, were pursuing them. His own men were retreating steadily and in good order, facing round and pouring heavy volleys into the French cavalry, as they charged them. The French attack on Macwitty had ceased, and Terence saw bodies of infantry moving towards the right where, on rising ground, a body of troops about a thousand strong were showing themselves menacingly. He had no doubt for a moment that this was Bull's command who, hearing the firing, and supposing that Terence was engaged there, had led his command straight to the scene of action. He at once sent an orderly back, at full gallop, to order the men in the valley to come on at the top of their speed; and then rode along the hillside and joined Bull, who was now closely engaged with the advancing columns of French. So hot was the fire, from Bull's own men and the guerillas, that the two French battalions wavered and came to a halt; and then, breaking into skirmishing order, advanced up the hill.