A history of the Peninsular War, Vol. 4, Dec. 1810-Dec. 1811

by Charles Oman

Practically the only difference between the engineers’ plans for the first[523] and the second siege of Badajoz was that in the latter more attention was paid to the attack on the south side, and the whole force of the besiegers was not concentrated on San Cristobal, as it had been in early May. A serious attempt was made to breach the Castle, not a mere demonstration or false attack. Yet, as matters turned out, all the stress of the work once more fell upon the San Cristobal front, where two desperate assaults were made and repulsed, while on the Castle front matters never got to the point of an attempted storm. Summing up the siege in the words of D’Urban, Beresford’s chief of the staff, who watched it ruefully, we can only echo his conclusion ‘that the fact is that the engineers began upon the wrong side[524].’ Two geological peculiarities of the ground were fatal to success: the first was that on San Cristobal the soil is so shallow—three inches only on top of the hard rock—that it was impossible to construct proper trenches. The second was that the Castle hill is composed of a clay-slate which does not crumble, however much battered, and that the wall there was simply a facing to the native soil. Its stones might be battered down, but the hillside stood firm when the stones had fallen, and remained perpendicular and inaccessible. The latter fact could not be known to Wellington’s engineers; but the former was fully within their cognizance, owing to their experience in the first siege. There can be no doubt that they ought to have selected for battering the south front—either the point where Soult worked during February, or still better the walls nearer the river, by the bastion of San Vincente, where the ground is equally favourable and there is no flanking external defence like the Pardaleras fort. If every gun had been concentrated on this section, and every available man set to trench-work against it, there can be little doubt that Wellington would have got Badajoz within the scant four weeks that were at his disposal.

Though the blockade had been resumed on May 18th, the actual siege did not recommence for some days later, since the troops from the Beira, who were to conduct it, did not get up till a week had passed. On May 25th Houston’s division arrived from Campo Mayor, and took position on the heights beyond San Cristobal; they were there joined by the 17th Portuguese from the garrison of Elvas, and two regiments of Algarve Militia (Tavira and Lagos) were assigned for transport and convoy duty between the trenches and Elvas. Picton and the 3rd Division came up two days later (May 27th), crossed the Guadiana by the ford above the city, and joined Hamilton’s Portuguese on the southern bank. An earlier arrival of the Beira divisions would have been of no great use, since it was only on the 29th that Colonel Alexander Dickson, who had once more been entrusted with the artillery arrangements, had sent off his great convoy of guns from Elvas. This time that indefatigable officer had collected a siege-train twice as large as that which he had prepared for Beresford four weeks earlier—there were forty-six guns in all[525] instead of twenty-three. But unhappily the pieces were the same as those used in the first siege, or their equals in age and defects. The large majority were the old brass 24-pounders of the seventeenth century which had already given so much trouble from their irregularity of calibre, their tendency to droop at the muzzle when much used, and their tiresome habit of ‘unbushing’ (i. e. blowing out their vent fitting). Six iron ship-guns, ordered up from Lisbon, only arrived when the siege was far advanced, and were the sole weapons of real efficiency with which Dickson was provided. It is clear that head quarters might have done something in the way of ordering up better guns early in May, the moment that the first siege had shown the deficiencies of the Elvas museum of artillery antiquities. The gunners, like the guns, were about doubled in number since Beresford’s fiasco: there were now over 500 Portuguese, and one company of British (Raynsford’s), 110 strong, who arrived from Lisbon on the 30th, riding on mules which had been provided at Estremos to give them a rapid journey. To aid the twenty-one engineers on the spot, eleven officers from line battalions had been taken on as assistant engineers, while the twenty-five military artificers had to train 250 rank and file, selected from the 3rd and 7th Divisions, to act as carpenters, miners, and sappers. The work of these amateurs was, as might have been expected, not very satisfactory, and the make of their gabions and fascines left much to be desired.

On May 29th the siege work began, by the opening up of the old trenches opposite the Pardaleras fort, which the French had filled in on the day of Albuera. This was merely done to draw the attention of the garrison away from the real points of attack, for there was no intention of approaching the place from the south. It would have been better for the Allies had this been a genuine operation, and if the Castle and San Cristobal attacks had been false! It attracted, as was intended, much notice from the garrison.

On the night of the 30th the serious work began. On the Castle side 1,600 men from the 3rd Division commenced at dusk a long trench, on the same ground that had been dug over during the first siege, and three zigzag approaches to it from the rear. This trench, the first parallel, was no less than 800 yards from the Castle. The attention of the enemy was so much drawn to other points, and the soil was so soft, that by daybreak there had been formed a trench 1,100 yards long, with a parapet three feet high, and a depth of three feet in the ground: the approaches were also well advanced. On San Cristobal, at the other attack, everything went very differently. The ground chosen for the first parallel was, owing to the exigencies of the contour of the hill, only 400 yards from the fort. The working parties were discovered at once, and a heavy fire was directed on them, not only from San Cristobal, but from the Castle, across the river. It was found that there was no soil to dig in—what little once existed had been used in building the old trenches of the first siege, and the French governor, during his days of respite, May 15-18, had ingeniously ordered that all this earth should be carted away, and thrown down the steep towards the river. All that could be done was to place a row of gabions along the intended line of trench, and to begin to bring up earth from below to stuff them. At daylight there was not more than two feet of earth thrown up along the more important points in the parallel, where it was intended that three batteries should be placed. The enemy’s fire soon knocked over the gabions, and the working parties had to be withdrawn from a great part of the front. Practically nothing had been accomplished, and there had been many casualties.

Things continued to go on in the same fashion during the succeeding days. The parallel opposite the Castle was easily completed with little loss; a great battery for twenty guns was thrown up in the middle of it, and received its pieces, sixteen brass 24-pounders and four howitzers, on the night of the 2nd-3rd. No attempt was made to begin a second parallel nearer the Castle, from which it could be battered at short range. On the other hand the San Cristobal attack encountered heart-rending difficulties from the want of soil; the screen of gabions was knocked about, the two batteries opposite the fort made little progress, and the only thing completed was a third battery, at the extreme edge of the hill, which was far enough away to escape destruction, but also too far away (1,200 yards) to do much damage. It seemed so hopeless to work on the bare rock that Wellington ordered £400 worth of wool-packs to be bought in Elvas, and when these were brought up on June 2 they proved impermeable to shot, and a solid start could be made for the parapets of the batteries. But the enemy kept dropping shells, from mortars in the Castle, among the working parties, with great accuracy, and the casualties were many. On June 2nd two small batteries, for five and eight guns respectively, had at last been erected about 450 yards from the fort, and a third behind them, in support, for four more guns, which were to shoot over the parallel.

At half-past nine in the morning of June 3rd the batteries on both fronts began to play on their chosen objectives. The fire was at first wild, owing to the eccentric behaviour of the old seventeenth-century brass guns, every one of which had its tricks and deficiencies. As the gunners began to learn and humour them, some effect began to be produced, especially on the Castle. Here great flakes of masonry began to fall in the evening, but it was noticed that behind the stone facing there was a core of clay-slate, the natural soil of the Castle hill, which remained perpendicular when the masonry crumbled. On San Cristobal, the south-east front of the fort, the one selected for breaching, was somewhat damaged, and the guns nearly silenced by evening. But the besiegers’ artillery had already begun to fall off in strength: only one piece had been disabled by the French, but four others had gone out of action owing to their own faults, ‘unbushing,’ ‘muzzle drooping,’ or carriages shaken to pieces by recoil. The second day of fire (June 4th) was hardly more satisfactory in its results: against the Castle the guns made better practice so far as accurate hitting the mark went, but the balls seemed to have no effect: the core of soil behind the breached masonry remained nearly as perpendicular as on the preceding evening. ‘Eight-inch shells fired against it would not penetrate it,’ wrote the disgusted Alexander Dickson, ‘but absolutely dropped back, and burst below among the rubbish[526].’ Meanwhile one more gun in this attack was disabled by the French fire, two by ‘muzzle drooping,’ and three howitzer carriages were so shaken that they had to be withdrawn for repairs. Only thirteen guns out of the original twenty were firing at sunset, and ‘the failure of the old brass pieces was becoming so alarming that an interval of seven to eight minutes was ordered between each round, to give the metal time to cool[527].’ A new battery was constructed at the right end of the parallel, near the river, at a point somewhat nearer to the Castle than the original battery, in the hope that fire from a distance shorter by a hundred yards might have better effect, and five guns were moved into it under cover of the night.

On San Cristobal the second day’s fire was a little better in results, the flank of the fort which was selected for breaching having its parapet knocked to pieces, and much debris having fallen into the ditch. But unknown to the besiegers, whose view could not command the bottom of the ditch, the French removed most of the stones and rubbish during the night, so that the accumulation at the bottom, on which the practicability of the future breach depended, was much smaller than was supposed by the British engineers. Two more guns and two howitzers in this attack were out of action by the evening—all owing to their own defects, not to the fire from the fort. The batteries were much incommoded by an enfilading fire across the river from the Castle, where some guns had been placed on a high ‘cavalier’ to bear on the slopes below Cristobal.

On June 5 affairs went on much in the same style: the breaching of the Castle was an absolute failure: ‘the practice was extremely good, but the bank of earth at the breach still remained perpendicular[528].’ It was discovered, however, that the French were so far alarmed at the results of the battering that they were constructing elaborate inner retrenchments behind the breach. On Cristobal the prospects looked more promising; so much of the wall as was visible over the edge of the ditch along the attacked front was demolished for a distance of many yards. With another day’s fire it was decided that the breach would be practicable[529].

Accordingly the batteries on both sides of the river thundered away for the whole day on the 6th, the Castle attack with fourteen guns out of its original twenty, the Cristobal attack with seventeen remaining out of twenty-three. On the former front the results were somewhat more satisfactory than those of the three first days of battering: the seam in the castle wall appearing much wider, and the accumulation of rubbish at its foot beginning to look appreciable. Observers in the trenches held that a single man, climbing unhindered, might get up to the top, but of course there was a great difference between such a scrambling place and a ‘practicable breach.’ Nothing, at any rate, could yet be done on this side in the way of assault. There were, it must be remembered, 800 yards of open ground between the parallel from which a storming-column must start and the foot of the damaged wall, not to speak of the muddy bed of the Rivillas brook, which had to be forded in order to reach the Castle hill.

The San Cristobal breach, on the other hand, was judged ripe for assault, though the condition of its lower part was not accurately known. According to French accounts it was probably practicable at dusk, but the moment that night fell sixty men went down into the ditch, and began clearing away the débris with such energy that there was a sheer seven-foot drop once more, at midnight, between the bottom of the excavation and the lip of the battered wall above it. The garrison also stuffed up the breach with chevaux de frise, and carts turned upside down and jammed together, while the sappers in the fort prepared a quantity of fourteen-inch bombs, to be thrown by hand into the ditch when an assault should be made. It is probable that the delay of over four hours between dark (7.30) and midnight, when the storm came, just sufficed to provide defences strong enough to render the attack hopeless. The governor of the fort, Captain Chauvin of the 88th Line, deserves all credit for his admirable activity and resource.