On the Rhine, the advance of a Prussian-Hessian army, 63,000 strong, rapidly drove back Custine from the Main into the valleys of the Saar and the Lauter. An Austrian corps under Wurmser soon afterwards invaded Alsace. Here, as on the northern frontier, there was a long period of trial and error, of denunciations and indiscipline, and of wholly trivial fighting, before the Republicans recovered themselves. But in the end the ragged enthusiasts found their true leader in Lazare Hoche, and, though defeated by Brunswick at Pirmasens and Kaiserslautern, they managed to develop almost their full strength against Wurmser in Alsace. On the 26th of December the latter, who had already undergone a series of partial reverses, was driven by main force from the lines of Weissenburg, after which Hoche advanced into the Palatinate and delivered Landau, and Pichegru moved on to recapture Mainz, which had surrendered in July. On the Spanish frontier both sides indulged in a fruitless war of posts in broken ground. The Italian campaign of 1793, equally unprofitable, will be referred to below. Far more serious than either was the insurrection of Vendée (q.v.) and the counter-revolution in the south of France, the principal incidents of which were the terrible sieges of Lyons and Toulon.
For 1794 Carnot planned a general advance of all the northern armies, that of the North (Pichegru) from Dunkirk-Cassel by Ypres and Oudenarde on Brussels, the minor Army of the Ardennes to Charleroi, and the Army of the Campaign of 1794. Moselle (Jourdan) to Liége, while between Charleroi and Lille demonstrations were to be made against the hostile centre. He counted upon little as regards the two armies near the Meuse, but hoped to force on a decisive battle by the advance of the left wing towards Ypres. Coburg, on the other side, intended, if not forced to develop his strength on the Ypres side, to make his main effort against the French centre about Landrecies. This produced the siege of Landrecies, which need not concern us, a forward movement of the French to Menin and Courtrai which resulted in the battles of Tourcoing and Tournai, and the campaign of Fleurus, which, almost fortuitously, produced the long-sought decision.
The first crisis was brought about by the advance of the left wing of the Army of the North, under Souham, to Menin-Courtrai. This advance placed Souham in the midst of the enemy’s right wing, and at last stimulated the Allies into adopting the plan that Mack had advocated, in season and out of season, since before Neerwinden—that of annihilating the enemy’s army. This vigorous purpose, and the leading part in its execution played by the duke of York and the British contingent, give these operations, to Englishmen at any rate, a living interest which is entirely lacking in, say, the sieges of Le Quesnoy and Landrecies. On the other side, the “New French” armies and their leaders, without losing the energy of 1793, had emerged from confusion and inexperience, and the powers of the new army and the new system had begun to mature. Thus it was a fair trial of strength between the old way and the new.
In the second week of May the left wing of the Army of the North—the centre was towards Landrecies, and the right, fused in the Army of the Ardennes, towards Charleroi—found itself interposed at Menin-Courtrai-Lille between two hostile masses, the main body of the allied right wing about Tournai and a secondary corps at Thielt. Common-sense, therefore, dictated a converging attack for the Allies and a series of rapid radial blows for the French. In the allied camp common-sense had first to prevail over routine, and the emperor’s first orders were for a raid of the Thielt corps towards Ypres, which his advisers hoped would of itself cause the French to decamp. But the duke of York formed a very different plan, and Feldzeugmeister Clerfayt, in command at Thielt, agreed to co-operate. Their proposal was to surround the French on the Lys with their two corps, and by the 15th the emperor had decided to use larger forces with the same object.
On that day Coburg himself, with 6000 men under Feldzeugmeister Kinsky from the central (Landrecies) group, entered Tournai and took up the general command, while another reinforcement under the archduke Charles Mack’s “annihilation plan.” marched towards Orchies. Orders were promptly issued for a general offensive. Clerfayt’s corps was to be between Rousselaer and Menin on the 16th, and the next day to force its way across the Lys at Werwick and connect with the main army. The main army was to advance in four columns. The first three, under the duke of York, were to move off, at daylight on the 17th, by Dottignies, Leers and Lannoy respectively to the line Mouscron-Tourcoing-Mouveaux. The fourth and fifth under Kinsky and the archduke Charles were to defeat the French corps on the upper Marque, and then, leaving Lille on their left and guaranteeing themselves by a cordon system against being cut off from Tournai (either by the troops just defeated or by the Lille garrison), to march rapidly forward towards Werwick, getting touch on their right with the duke of York and on their left with Clerfayt, and thus completing the investing circle around Souham’s and Moreau’s isolated divisions. Speed was enjoined on all. Picked volunteers to clear away the enemy’s skirmishers, and pioneers to make good difficult places on the roads, were to precede the heads of the columns. Then came at the head of the main body the artillery with an infantry escort. All this might have been designed by the Japanese for the attack of some well-defined Russian position in the war of 1904. Outpost and skirmisher resistance was to be overpowered the instant it was offered, and the attack on the closed bodies of the enemy was to be initiated by a heavy artillery fire at the earliest possible moment. But in 1904 the Russians stood still, which was the last thing that the Revolutionary armies of 1794 would or could do. Mack’s well-considered and carefully balanced combinations failed, and doubtless helped to create the legend of his incapacity, which finds no support either in the opinion of Coburg, the representative of the old school, or in that of Scharnhorst, the founder of the new.
Souham, who commanded in the temporary absence of Pichegru, had formed his own plan. Finding himself with the major part of his forces between York and Clerfayt, he had decided to impose upon the former by means of a covering detachment, and to fall upon Clerfayt near Rousselaer with the bulk of his forces. This plan, based as it was on a sound calculation of time, space, strength and endurance, merits close consideration, for it contains more than a trace of the essential principles of modern strategy, yet with one vital difference, that whereas, in the present case, the factor of the enemy’s independent will wrecked the scheme, Napoleon would have guaranteed to himself, before and during its development, the power of executing it in spite of the enemy. The appearance of fresh allied troops (Kinsky) on his right front at once modified these general arrangements. Divining Coburg’s intentions from the arrival of the enemy near Pont-à-Marque and at Lannoy, he ordered Bonnaud (Lille group, 27,000) to leave enough troops on the upper Marque to amuse the enemy’s leftmost columns, and with every man he had left beyond this absolute minimum to attack the left flank of the columns moving towards Tourcoing, which his weak centre (12,000 men at Tourcoing, Mouscron and Roubaix) was to stop by frontal defence. No rôle was as yet assigned to the principal mass (50,000 under Moreau) about Courtrai. Vandamme’s brigade was to extend along the Lys from Menin to Werwick and beyond, to deny as long as possible the passage to Clerfayt.
This second plan failed like the first, because the enemy’s counter-will was not controlled. All along the line Coburg’s advance compelled the French to fight as they were without any redistribution. But the French were sufficiently elastic to adapt themselves readily to unforeseen conditions, and on Coburg’s side too the unexpected happened. When Clerfayt appeared on the Lys above Menin, he found Werwick held. This was an accident, for the battalion there was on its way to Menin, and Vandamme, who had not yet received his new orders, was still far away. But the battalion fought boldly, Clerfayt sent for his pontoons, and ere they arrived Vandamme’s leading troops managed to come up on the other side. Thus it was not till 1 A.M. on the 18th that the first Austrian battalions passed the Lys.
On the front of the main allied group the “annihilation plan” was crippled at the outset by the tardiness of the archduke’s (fifth or left) column. On this the smooth working of the whole scheme depended, for Coburg considered that he must defeat Bonnaud before carrying out his intended envelopment of the Menin-Courtrai group (the idea of “binding” the enemy by a detachment while the main scheme proceeded had not yet arisen). The allied general, indeed, on discovering the backwardness of the archduke, went so far as to order all the other columns to begin by swerving southward against Bonnaud, but these were already too deeply committed to the original plan to execute any new variation.
The rightmost column (Hanoverians) under von dem Bussche moved on Mouscron, overpowering the fragmentary, if energetic, resistance of the French advanced posts. Next on the left, Lieutenant Field Marshal Otto moved by Leers and Watrelos, driving away a French post at Lis (near Lannoy) on his left flank, and entered Tourcoing. But meantime a French brigade had driven von dem Bussche away from Mouscron, so that Otto felt compelled to keep troops at Leers and Watrelos to protect his rear, which seriously weakened his hold on Tourcoing. The third column, led by the duke of York, advanced from Templeuve on Lannoy, at the same time securing its left by expelling the French from Willems. Lannoy was stormed by the British Guards under Sir R. Abercromby with such vigour that the cavalry which had been sent round the village to cut off the French retreat had no time to get into position. Beyond Lannoy, the French resistance, still disjointed, became more obstinate as the ground favoured it more, and the duke called up the Austrians from Willems to turn the right of the French position at Roubaix by way of a small valley. Once again, however, the Guards dislodged the enemy before the turning movement had taken effect. A third French position now appeared, at Mouvaux, and this seemed so formidable that the duke halted to rest his now weary men. The emperor himself, however, ordered the advance to be resumed, and Mouvaux too was carried by Abercromby. It was now nightfall, and the duke having attained his objective point prepared to hold it against a counter attack.