THE LINES OF TORRES VEDRAS

We have hitherto, when speaking of Wellington’s immense scheme for fortifying the position on which he intended to bring his enemy to a standstill, refrained from entering into the details of his plan. It is now time to describe it in full, and to explain its design.

The character of the peninsula on which Lisbon stands lends itself sufficiently well to defence. At a first inspection the country-side offers a rather chaotic expanse of mountain and valley, whose general features are hard to seize from any one point. On further examination, it appears that the whole square mass of land between the Atlantic and the Tagus estuary is nothing more than a continuation of the ridge of the Serra de Monte Junta, the main mountain-chain of Estremadura. But from the backbone or central mass of the highland so many large spurs are thrown out to each side, and these are themselves so high and steep, that the whole peninsula seems more like a ganglion of mountains than a well-marked chain. The two chief joints or vertebrae in the backbone are the Monte Agra?a above Sobral, and the Cabe?a de Montechique six miles south of it, and these form the central points respectively of the first and second lines of defence which were finally laid out. Besides the outer defences there was in Wellington’s scheme, from the very start, an inner ring of works, covering only a small area on the sea-shore, at the southernmost point of the peninsula, to the west of Lisbon. This was merely intended to cover an embarkation, if by any unforeseen disaster the Lines themselves should be pierced.

It remains to speak of the system of defences in detail. In October 1809, Wellington’s plan had embraced no more than one continuous line of works from Alhandra on the Tagus to the[p. 420] mouth of the Rio S?o Louren?o on the Atlantic, with certain redoubts and fortified camps thrown out in front, at Torres Vedras, Monte Agra?a, and other points. These latter fortifications were not intended to be held in permanence; but it was hoped that they might defer and hinder the enemy’s attack on the main line in the rear. It was only the long delay in Masséna’s advance, which gave Wellington five or six months on which he had not counted, that led to the ultimate strengthening of the scattered outer works, and their conversion into a continuous whole, capable of turning back, instead of merely detaining for a time, the invading army. Indeed, all across the peninsula, designs that were slight, isolated, and provisional when first drawn up, were in the end enlarged, and perfected into wholly different structures. For the engineers, having unlimited labour at their disposal, and much more time than had been promised them, could turn their attention, after the essential works had been completed, to devising all manner of additional improvements and securities for the chosen position.

The construction of the Lines was entrusted to Colonel Fletcher, Wellington’s commanding engineer, who had as his chief assistant Major John Jones, the historian of the works, and in addition eleven British officers of the Royal Engineers, two from the King’s German Legion, and three from the Portuguese regular army. Wellington himself, after making one all-embracing survey of-the positions in Fletcher’s company in October 1809, and another in February 1810, left all the rest to his subordinate, and refrained from worrying him with matters of detail, being satisfied that his own intentions had been thoroughly well grasped. The labour available was, firstly, that of the Lisbon militia regiments, who were brought up by alternate pairs, and paid an extra 4d. a day for their services[478]; secondly, that of hired volunteers from the peasantry of the district, of whom from 5,000 to 7,000 were generally in hand; they received 1s., afterwards 1s. 8d. a day[479]; and lastly of a conscription from the whole of southern Estremadura, for a circuit of forty miles around. The forced labour was paid at the same rate as[p. 421] that freely hired. On the whole, only about ￡100,000 was paid out between November 1809 and September 1810—so that the Lines of Torres Vedras may be considered one of the cheapest investments in history. The militiamen and peasantry were worked in gangs of some 1,000 or 1,500 men, each in charge of an engineer officer, who had a few English and Portuguese military artificers as his assistants: only 150 such were available, so short were both armies of trained men. ‘In some districts a subaltern officer of engineers with a few English soldiers, utterly ignorant of the language, directed and controlled the labour of 1,500 peasantry, many of them compelled to work at a distance of forty miles from their homes, while their lands lay neglected. Nevertheless, during a year of this forced labour not a single instance of insubordination or riot occurred. The great quantity of work performed should, in justice to the Portuguese, be ascribed more to the regular habit of persevering labour in those employed than to the efficiency of the control exercised over them[480].... Indeed, it is but a tribute of justice to the Portuguese of Estremadura to state that, during many months of constant personal intercourse, both private and public, the labouring classes ever showed themselves respectful, industrious, docile, and obedient, while the governing classes in every public transaction evinced much intelligence, patriotism, good sense, and probity. Secrecy with respect to the extent and nature of the works was enjoined, and it is highly creditable to all concerned that hardly a vague paragraph concerning the Lines found its way into the public prints. The French invaders remained ignorant of the nature of the barrier rising against them, till they found our army arrayed on it so as to stop their further advance[481].’

The total frontage of the southern and stronger series of lines, those which Wellington originally planned as his line of defence, was twenty-two miles from sea to sea. The outer and northern series of works, which was originally only a supplement and outer bulwark to the other, was longer, extending to twenty-nine miles, for it crosses the peninsula in a diagonal fashion and not on the shortest possible line that could be drawn. Lastly,[p. 422] the small interior line round St. Julian’s and Oyeras, which was prepared as the embarking-place of the army in the event of defeat, has a circumference of about two miles. In all, therefore, fifty-three miles of defences were planned—a stupendous work, far exceeding, when its elaborate details are studied, anything that had been constructed in modern times in the way of field-fortification.

It must be remembered that the character of the Lines in no way resembles that of our own great Roman wall from Tyne to Solway, of the wall of China, or of any other long continuous stretch of masonry. It is only on a few points that works of any great length are to be found. The Lines are in essence a series of closed earthworks, dotted along the commanding points of the two ranges of hills which Wellington chose as his first and second fronts of resistance. Some few of the earthworks rose to the dignity of fortified camps, armed with many scores of guns. The majority of them were small redoubts, constructed to hold three to six guns and garrisons of two or three hundred men only. But even the smallest of them were individually formidable from their structure: the normal ditch was 16 feet wide and 12 feet deep, the parapets 8 to 14 feet thick, and all were properly fitted with banquettes. When it is remembered that they were well palisaded, and had outer hindrances of abattis, chevaux de frise, and trous-de-loup scattered in front, it is clear that they were forts requiring a regular attack, not mere lines of trench and mound. The strength of the whole series was that they were placed in scientific fashion, so as to cross fires over all the ground on which an attacking force was likely to present itself. No practicable point of assault could be found on which advancing columns would not be cut up by flanking fire for a very long distance, before they drew near to their objective. Immense pains had been taken to make the more exposed sections of the country-side into one vast glacis. Mounds which might have given cover had been removed to the last stone, hollow roads filled up, houses pulled down, olive-groves and vineyards stubbed up to the roots, so as to give a perfectly smooth and featureless ascent up to the line of redoubts. Greatly to Wellington’s credit (as may be incidentally remarked) compensation was paid on a liberal scale to all owners[p. 423] of dwellings, mills, fruit-trees, &c., for the havoc made by these necessary pieces of demolition. The result was a complete clearance of cover. ‘We have spared neither house, garden, vineyard, olive-trees, woods, or private property of any description,’ wrote the officer in charge of the works to his chief at the end of the preparations: ‘the only blind to the fire of the works now standing anywhere is that beautiful avenue of old trees in the pass of Torres Vedras. The Juiz da Fora and the inhabitants pleaded with me so hard for the latest moment, lest they might be cut down unnecessarily, that I have consented to defer it till the day before the troops march in. As I have trustworthy men with axes in readiness on the spot, there is no doubt of their being felled in time. The pine woods on the Torres heights are already down, and formed into abattis[482].’

It was not necessary, or indeed possible, to slope into a glacis the whole of the ground in front of each of the lines of defences. In many places other methods of making it impassable were used. At the north-western front of the first line, between Torres Vedras and the sea, for nearly six miles, a long marsh had been created: the river Zizandre had been dammed up, and had filled the whole of the narrow bottom in which it flows. ‘It has overflowed its banks, and in a short time more than half the valley has become so complete a bog that no reward can induce any of the peasantry to pass over it[483],’ wrote the officer who had carried out the experiment. Nor was it possible for the enemy to attempt to drain the bog, for four[484] redoubts furnished with heavy guns, and placed on dominating points of the hillside, commanded the bottom so completely that it was impossible for any party to approach it with safety. Yet the redoubts were out of the range of field-guns on the slopes beyond the Zizandre: only guns of position could have touched them, and Masséna had none such with him. Two[p. 424] similar inundations on a smaller scale had been caused at the other end of the Lines, by damming up the Alhandra and Alverca streams, each of which spread out in a marsh a mile broad, reaching to the foot of the heights above the Tagus, and could only be passed on the narrow paved high-road from Santarem to Lisbon.

In other places a very different method of making the Lines unapproachable had been adopted. Where the heights were very steep, but not absolutely inaccessible—a dangerous thing to the defence, for here ‘dead ground,’ unsearchable by the cannon of the redoubts above, must almost necessarily occur,—the slope had been cut or blasted away in bands, so as to make absolute precipices on a small scale. At one point above Alhandra[485] this was done on a front of full 2,000 yards. Even this was not the last precaution taken: at several places ravines ran deep into the line, and up them columns, more or less under cover, might possibly have penetrated. Such ravines, therefore, were stuffed, at chosen points, by a broad abattis or entanglement, mainly composed of olive-trees with all their chief boughs remaining, dragged together and interlaced for a depth of many yards. Such a structure could not be crawled through, nor could it be hewn down without an infinite waste of time and labour; nor, on the other hand, did it afford any cover, since grape or musketry could play perfectly well through it. The chief of these traps was that laid across the long ravine above the village of Arruda, down the bottom of which flows one of the winter torrents which fall eastward into the Tagus.

It was fortunate that Portugal was a well-wooded country: there are regions where it would be impossible to procure the immense amount of timber that was lavished on the accessories of the redoubts. All, as has been already mentioned, were palisaded; many had in addition abattis or entanglements thrown up in front of them, some way down the hillside, so as to detain the advancing enemy under fire as long as possible.

The works were divided into eight sections, the first line[p. 425] composed of four, the second line of three, while the eighth consisted of the inner retrenchment for purposes of embarkation, at the extreme southern point of the peninsula. Of the outer or secondary line the three sections were:

(1) A front of five miles from the Tagus at Alhandra along the crest of a steep but not very lofty ridge, as far as the great ravine that overlooks the village of Arruda. This front was elaborately fortified, as it blocks the great road, in the flat by the waterside, which forms the easiest approach to Lisbon from the north. In the five miles there were ultimately constructed no less than 23 redoubts with 96 guns. Two thousand yards of hillside in one place had been scarped into a precipice; a mile by the side of the Tagus had been inundated. The one considerable gap in the line, the ravine at the head of the valley of Calandriz, had been choked by one of the great abattis above described. The redoubts required a garrison of 6,000 men.

(2) The second section, from the ravine above Arruda to the left of the steep Monte Agra?a, formed somewhat of a salient angle: it had a front in all of some four and a half miles, which included the most lofty and defensible part of the backbone range of the Lisbon peninsula. One of the four great paved roads entering the capital from the north, however, passes over the shoulder of these heights, and they were therefore very heavily fortified from the first, the large redoubt for 1,600 men, on the top of Monte Agra?a being one of the original outer works ordered for construction in Wellington’s earliest notes of October 1809. There were in all seven redoubts mounting 55 guns and requiring a garrison of 3,000 men on this fraction of the lines.

(3) Quite different in character was the front of eight miles from the left of Monte Agra?a to the pass of Runa, overlooking the upper valley of the Zizandre and the village of Sobral. The fortification of this line had not entered into Wellington’s original plan, and there were only two redoubts upon it when Masséna appeared before it in October 1810. Such defence as there was consisted in the fact that the dominating Monte Agra?a redoubts overlooked it on the right, and that the two small works just mentioned commanded the main high-road from Sobral to Cabe?a de Montechique, which goes through its centre.[p. 426] But there was a clear possibility that the enemy might make a push up the valley and the high-road, by the village of Zibreira, and this was indeed the most probable point of attack in the whole 29 miles of front for the enemy to select. When, at the last moment, the British Commander-in-Chief determined to hold the outer lines, and not merely to fall back after having used them for a temporary defence, he had to cram this point with troops, and to construct new works upon it as quickly as possible. Four divisions, therefore, more than 20,000 men, were concentrated here. Wellington’s own head quarters were established at the hamlet of Pero Negro, on the slope above the high-road, and a very large redoubt was thrown up on the Portello hill, above Zibreira, with several smaller ones further to the right, to connect it with the Monte Agra?a works. Sobral, the village at the foot of the heights, was held as an outpost, but abandoned when Masséna pushed forward to the front, as it was too far advanced to the north to be treated as an integral part of the position. But the French, when they had carried Sobral with difficulty, looked at the main line behind it, and refused to attempt any further advance. The hillside was as formidable as the Bussaco heights from which they had only recently been repulsed: it was full of troops and growing in strength every moment as the earthworks continued to arise.

(4) The fourth section of the outer or northern front was that from the gorge of the Zizandre (or the pass of Runa, as it is sometimes called) to the sea. It was about twelve miles long, but of this space six miles and more was covered by the impassable bog formed by the obstructed Zizandre, and another mile was formed by the formidable entrenched camp of San Vincente, above the town of Torres Vedras, the most complete and self-sufficing of all the works in the peninsula. This stronghold lay outside the main line, beyond the river, covering the bridge and the paved chaussée from Leiria to Lisbon, the only carriage-road on the western side of the Lines[486]. It was one of[p. 427] the earliest of the fortifications commenced by Wellington’s engineers, having been started on November 8, 1809, and was placed in such a conspicuous point, and planned on such a large scale, that it attracted public attention more than any other part of the works, and gave its name to the whole in popular parlance[487]. The whole front on both sides of Torres Vedras and its great fort was so strong and inaccessible as to offer little temptation to the invader to select it as a point of serious attack, all the more so because troops brought opposite to it would be completely cut off from any left in front of the eastern and central part of the lines. For the geography of the peninsula at this point is peculiar: north of the gorge of the Zizandre the great backbone range, the Serra de Barregudo and the Serra de Monte Junta, extends for a distance of fifteen miles, without being crossed by a single road practicable for horses, much less for wheeled vehicles. There are nothing but goat-tracks across the heights. If, therefore, any considerable body of troops had been sent to observe or contain the western section of the lines, it would have been separated by two days’ march from the rest of the army, and liable to be crushed, ere succoured, by the defenders of Lisbon, who had good cross-roads across the peninsula, by which they could transfer themselves from point to point under the protection of their works. As a matter of fact, nothing but flying parties of French horse ever appeared in this direction. Masséna had not troops to spare for any secondary attack, more especially for one on such an unpromising part of the Lines. Wellington had foreseen this when he distributed his field army behind the various sections of the front: to support the garrisons of the twelve miles of redoubts about Torres Vedras he only placed one division, while there were three behind the eastern section, and more than four in the partially entrenched central part[488].