retrenched and manned, as was also the convent of Santa Cruz, which stands isolated 200 yards outside the north-west angle of the town. Other outlying buildings had been levelled to the ground, lest they should afford cover to the enemy. [Illustration: SIEGE OF CIUDAD RODRIGO] These preparations were very wise and helpful, but they did not do away with the main weakness of Ciudad Rodrigo considered as a modern fortress. Like many other mediaeval strongholds it is commanded by outlying heights, which could be disregarded as an element of danger in the fourteenth or the sixteenth century, because of their distance, but became all-important with the improvement of artillery. In this case two knolls, considerably higher than that on which the place stands, lie outside its northern walls. The smaller, named the Little Teson, lies only 200 yards from the northern angle of the town; it is some fifty feet higher than the base of the ramparts. Immediately behind it rises the Great Teson, which dominates the whole country-side, its broad flat top, three-quarters of a mile in diameter, being a hundred feet above the level of the plain. It was hopeless to think of holding the little Teson as an outwork, since the greater one looks down into it and searches it from end to end. The Great Teson, on the other hand, is so large--its circuit is about the same as the city itself--that it would be impossible to think of defending it, as when entrenched it would require a garrison of at least 3,000 men, and Herrasti had but 5,500 troops under his command. Its slopes, moreover, are gentle, and do not lend themselves to fortification. The southern edge of the plateau of the Great Teson being only 500 yards from the town wall, it was obvious that here was the place from which Rodrigo could best be assailed. Batteries on its sky-line could breach both the inner and outer walls, and could command every square foot both of the town and of the fortified suburbs. Accordingly the brigades which lay before the place in May had encamped on and behind the Teson, and stored the gabions, fascines, and sandbags which they were making in a park, near the convent of La Caridad and the village of Pedro de Toro, on its further side.