An event soon occurred which showed how wide-spread were the intrigues of the French in the Flemish towns, and how insecure was the foundation on which the authority of the Allies rested there. An accidental circumstance led to the discovery of a letter put into the post-office of Ghent, containing the whole particulars of a plan for admitting the French troops into the citadel of Antwerp. Vendôme at the same time made a forward movement to take advantage of these attempts; but Marlborough was on his guard, and both frustrated the intended rising in Antwerp, and barred the way against the attempted advance of the French army. Disconcerted by the failure of this enterprise, Vendôme moved to Soignies at the head of an hundred thousand men, where he halted at the distance of three leagues from the Allied armies. A great and decisive action was confidently expected in both armies; as, although Marlborough could not muster above eighty thousand combatants, it was well known he would not decline a battle, although he was not as yet sufficiently strong to assume the offensive. Vendôme, however, declined attacking the Allies where they stood, and, filing to the right to Braine la Leude, close to the field of Waterloo, again halted in a position, threatening at once both Louvain and Brussels. Moving parallel to him, but still keeping on the defensive, Marlborough retired to Anderleet. No sooner had he arrived there, than intelligence was received of a farther movement to the right on the part of the French general, which indicated an intention to make Louvain the object of attack. Without losing an instant, Marlborough marched on that very night with the utmost expedition, amidst torrents of rain, to Parc, where he established himself in such strong ground, covering Louvain, that Vendôme, finding himself anticipated in his movements, fell back to Braine-le-Leude without firing a shot.[17]
Though Marlborough, however, had in this manner foiled the movement of the French general, he was in no condition to undertake offensive operations until the arrival of Eugene's army from the Moselle raised his force nearer to an equality with the preponderating masses of the enemy, headed by so able a general as Vendôme. The usual delays, however, of the German powers, for long prevented this object being attained. For about a month Marlborough was retained in a state of forced inactivity from this cause, during which period he bitterly complained, "that the slowness of the German powers was such as to threaten the worst consequences." At length, however, the pressing representations of the English general, seconded by the whole weight of Prince Eugene, overcame the tardiness of the German Electors, and the army of the Moselle began its march towards Brabant. But the Prince was too far distant to bring up his troops to the theatre of active operations before decisive events had taken place; and fortunately for the glory of England, to Marlborough alone and to his army belongs the honour of one of the most decisive victories recorded in its annals.
Encouraged by his superiority of numbers, and the assurances of support he received from the malecontents in the Flemish towns, Vendôme, who was both an able and enterprising general, put in execution, in the beginning of July, a design which he had long meditated, for the purpose of expelling the Allies from Brabant. This was by a sudden irruption to make himself master of Ghent, with several of the citizens of which he had established a secret correspondence. This city commands the course of the Scheldt and the Lys, and lay in the very centre of Marlborough's water communications; and as the fortifications of Oudenarde were in a very dilapidated state, it was reasonable to suppose that its reduction would speedily follow. The capture of these fortresses would at once break up Marlborough's communications, and sever the connecting link between Flanders and Brabant, so as to compel the English army to fall back to Antwerp and the line of the Scheldt, and thus deprive them of the whole fruits of the victory of Ramilies. Such was the able and well-conceived design of the French general, which promised the most brilliant results; and against a general less wary and able than Marlborough, unquestionably would have obtained them.
Vendôme executed the first part of this design with vigour and success. On the evening of the 4th July he suddenly broke up from Braine-le-Leude, and marching rapidly all night, advanced towards Hall and Tubise, dispatching at the same time, parties towards such towns in that quarter as had maintained a correspondence with him. One of these parties, by the connivance of the watch, made itself master of Ghent. At the same time Bruges was surrendered to another party under the Count de la Motte; the small but important fort of Plassendael was carried by storm, and a detachment sent to recover Ghent found the gates shut by the inhabitants, who had now openly joined the enemy, and invested the Allied garrison in the citadel.
Marlborough no sooner heard of this movement than he followed with his army; but he arrived in the neighbourhood of Tubise in time only to witness their passage of the Senne, near that place. Giving orders to his troops to prepare for battle, he put himself in motion at one next morning, intending to bring the enemy to an immediate action. The activity of Vendôme, however, baffled his design. He made his men, weary as they were, march all night and cross the Dender at several points, breaking down the bridges between Alort and Oerdegun, and the Allies only arrived in time to make three hundred prisoners from the rearguard. Scarcely had they recovered from this disappointment, when intelligence arrived of the surprise of Ghent and Bruges; while, at the same time, the ferment in Brussels, owing to the near approach of the French to that capital, became so great, that there was every reason to apprehend a similar disaster, from the disaffection of some of its inhabitants. The most serious apprehensions also were entertained for Oudenarde, the garrison of which was feeble, and its works dilapidated. Marlborough, therefore, dispatched instant orders to Lord Chandos, who commanded at Ath, to collect all the detachments he could from the garrisons in the neighbourhood, and throw himself into that fortress, and with such diligence were these orders executed that Oudenarde was secured against a coup-de-main, before the French outposts appeared before it. Vendôme, however, felt himself strong enough to undertake its siege in form. He drew his army round it; the investment was completed on the evening of the 9th, and a train of heavy artillery ordered from Tournay, to commence the siege,[18] while he himself with the covering army, took post in a strong camp at Lessines, on the river Dender.
Such was the chagrin experienced by Marlborough at these untoward events, that he was thrown into a fever, the result of fatigue, watching, and anxiety. His physician earnestly counselled him to leave the camp, and retire to Brussels, as the only means of arresting his distemper; but nothing could induce him to leave his post at such a crisis. He continued in his tent accordingly, and the orders were issued by Marshal Overkirk. He was greatly relieved on the 7th, by the arrival of Prince Eugene, who, finding his troops could not come up in time, had left his cavalry at Maestricht, and hastened in person, though without any followers but his personal suite, to take part in the approaching conflict. Great was the joy of Marlborough on learning the arrival of so illustrious a general; not a feeling of jealousy crossed the breast of either of these great men. His first words to Eugene were—"I am not without hopes of congratulating your Highness on a great victory; for my troops will be animated by the presence of so distinguished a commander." Eugene warmly approved the resolution he had taken of instantly attacking the enemy: and a council of war having been summoned, their united opinion prevailed over the objections of the Dutch deputies, who were now seriously alarmed for their barrier, and it was resolved to give battle to the enemy in his position in front of Oudenarde.[19]
The Allies broke up at two in the morning of the 9th July, and advanced towards the French frontiers at Lessines in four great columns. So rapid and well ordered was the march, that before noon the heads of the columns reached Herfilingen, fourteen miles fron Asche, whence they had started. Bridges were rapidly thrown over the Dender, and it was crossed early on the following morning in presence of Eugene and Marlborough, whom the animation of the great events in progress, had, in a manner, raised from the bed of sickness.[20] Here the duke halted, and the troops encamped in their order of march with their right on the Dender and their front covered by a small stream which falls into that river. By this bold and rapid movement, Vendôme's well-concerted plan was entirely disconcerted; Marlborough had thrown himself between the French and their own frontier; he had rendered himself master of their communications; and instead of seeking merely to cover his own fortresses, threatened to compel them to fall back, in order to regain their communications, and abandon the whole enterprise which had commenced with such prospects of success. Vendôme was extremely disconcerted at this able movement, and he gave immediate orders to fall back upon Gavre, situated on the Scheldt below Oudenarde, where it was intended to cross that river.
No sooner was this design made manifest, than Marlborough followed with all his forces, with the double design of raising the investment of Oudenarde, and if possible forcing the enemy to give battle, under the disadvantage of doing so in a retreat. Anxious to improve their advantage, the Allied generals pushed forward with the utmost expedition, hoping to come up with the enemy when his columns and baggage were close upon the Scheldt, or in the very act of crossing that river. Colonel Cadogan, with a strong advanced guard, was pushed forward by daybreak on the 11th towards the Scheldt which he reached by eleven, and immediately threw bridges over, across which the whole cavalry and twelve battalions of foot were immediately thrown. They advanced to the summit of the plateau on the left bank of the river, and formed in battle array, the infantry opposite Eynes, the cavalry extending on the left towards Schaerken. Advancing slowly on in this regular array down the course of the river on its left bank, Cadogan was not long of coming in sight of the French rearguard under Biron, with whom he had some sharp skirmishing. Meanwhile, Marlborough and Eugene were pressing the passage at the bridges with all imaginable activity; but the greater part of their army had not yet got across. The main body was still half a league from the Scheldt, and the huge clouds of dust which arose from the passage of the artillery and carriages in that direction, inspired Vendôme with the hope that he might cut off the advanced guard which was over the Scheldt, before the bulk of the Allied forces could get across to their relief. With this view he halted his troops, and drew them up hastily in order of battle. This brought on the great and glorious action which followed, towards the due understanding of which, a description of the theatre of combat is indispensable.
"At the distance of a mile north of Oudenarde, is the village of Eynes. Here the ground rises into a species of low, but spacious amphitheatre. From thence it sweeps along a small plain, till it nearly reaches the glacis of Oudenarde, where it terminates in the village of Bevere. To the west the slope ascends to another broad hill called the Bosercanter; and at the highest point of the eminence stands a windmill, shaded by a lofty lime-tree, forming conspicuous objects from the whole adjacent country. From thence the ground gradually declines towards Mardlen; and the eye glancing over the humid valley watered by the Norken, rests on another range of uplands, which, gently sinking, at length terminates near Asper. Within this space, two small streams, descending from the lower part of the hill of Oycke, embrace a low tongue of land, the centre of which rises to a gentle elevation. The borders of these rivulets are crossed by frequent enclosures, surrounding the farm-yards of Barwaen, Chobon, and Diepenbeck. Near the source of one of these streams is a castellated mansion; at that of the other is the hamlet of Rhetelhouk, embosomed in a wooded nook. These streams unite at the hamlet of Scharken, and their united current flows in a marshy bed to the Scheldt, which it reaches near Eynes. The Norken, another river traversing the field, runs for a considerable distance parallel to the Scheldt, until, passing by Asper, it terminates in a stagnant canal, which joins the Scheldt below Gavre. Its borders, like those of the other streams, are skirted with coppice-wood thickets; behind are the enclosures surrounding the little plain. Generally speaking, this part of Flanders is even not merely of picturesque beauty and high cultivation, but great military strength; and it is hard to say whether its numerous streams, hanging banks, and umbrageous woods, add most to its interest in the eye of a painter, or to its intricacy and defensive character in warlike operations."[21]
As fast as the Allies got across the Scheldt, Marlborough formed them along the high grounds stretching from Bevere to Mooreghem Mill, with their right resting on the Scheldt. Vendôme's men stretched across the plain, from the hill of Asper on the left, to Warreghem on the right. A considerable body of cavalry and infantry lay in front of their position in Eynes, of which they had retained possession since they had repulsed Cadogan's horse. No sooner had the English general got a sufficient number of troops up, than he ordered that gallant officer to advance and retake that village. The infantry attacked in front, crossing the rivulet near Eynes; while the horse made a circuit, and passing higher, made their appearance in their rear, when the conflict was warmly going on in front. The consequence was, that the village was carried with great loss to the enemy, three entire battalions were cut off and made prisoners, and eight squadrons cut to pieces in striving to make their way across the steep and tangled banks of the Norken. This sharp blow convinced the French leaders that a general action was unavoidable; and though, from the vigour with which it had been struck, their remained little hope of overpowering the Allied advanced guard before the main body came up, yet they resolved, contrary to the opinion of Vendôme, who had become seriously alarmed, to persist in the attack, and risk all on the issue of a general engagement.[22]