Ferdinand's task, with an inferior force, was in its essence defensive. For him the supremely important thing was to retain possession of the line of the Weser, on which waterway he depended for his supplies alike from Germany and from England. Thus, roughly speaking, the field of operations lay between the Rhine on the one side and the Weser on the other, with the sea and the Main for northern and southern boundaries; and the normal front of the French would be to the east and of the Allies to the west. But it must be remembered that in addition to the army operating from Wesel against Ferdinand's front there was another operating from Frankfort upon his left or southern flank; while there was always the further danger that the Saxons might elude a Prussian corps of observation, which was posted to check them, on the south-east, and steal in upon Ferdinand's left rear. To defeat these combinations it was of vital importance to Ferdinand to hold in particular two fortresses—Münster in Westphalia, since the French, if they took it, could push on unhindered to the Weser and cut off his supplies; and Lippstadt on the Upper Lippe, which secured communications between Münster and Cassel, or in other words between Westphalia and Hesse, and contrariwise impeded the joint action of the two French armies. For the rest it will be useful to take note of three rivers which barred the advance of the French northward from Frankfort to Cassel and beyond: namely, counting from south to north, the Ohm, the Eder, and the Diemel. With the last in particular, as the final barrier between Hesse and Westphalia, we shall have much to do; so the reader would do well to grasp its position once for all, not neglecting its relation to the neighbouring waters of the Lippe and the Weser.
End of March.
April 13.
At the close of the campaign of 1758 Ferdinand's winter quarters extended from Coesfeld, a little to westward of Münster, through Münster, Lippstadt and Paderborn to the Diemel, his front facing thus somewhat to south of south-east. The French army of the Rhine under Marshal Contades was cantoned along that river from Wesel southward almost to Coblentz; while the army of the Main, under the Prince of Soubise, the defeated General of Rossbach, lay just to north of the river about Frankfort. Ferdinand's first trouble was with an advance of the Austrians upon his left flank by the river Werra. This he headed back by a rapid march to Fulda; and, being freed from this danger, he resolved to turn this enforced movement to southward to account by making a bold stroke upon Frankfort, so as, if possible, to paralyse the operations of the French on that side by snatching from them their base. Unfortunately for him, the incapable Soubise had been recalled to command the army for invasion of England, and Marshal Broglie, who had succeeded him, had entrenched himself in a strong position at Bergen, a little to the north of Frankfort. There on the 13th of April, just five days after the storm of Masulipatam, Ferdinand boldly attacked him,[350] but was repulsed with a loss of over two thousand men, and compelled to fall back to Ziegenhain, on the road to Cassel. His audacious attempt to cripple one French army, before the campaign had even been opened, had failed.
May.
May 27.
May 29.
After this alarm the French employed themselves busily in entrenching themselves on the Main. Prince Henry of Prussia, by King Frederick's direction, marched northward to relieve Ferdinand from further trouble from the Austrians; and the enemy made little movement during the ensuing month. On the 25th of April Contades arrived at Düsseldorf from Paris with an approved plan of campaign in his pocket, and proceeded to distribute the army of the Rhine into four corps, two of them about Wesel, a third at Düsseldorf, and a fourth about Cologne. This grouping, as Contades intended, left Ferdinand in doubt whether his main design was aimed at Westphalia or Hesse. The corps which guarded Westphalia included the British contingent under Lord George Sackville, who had been appointed to the command on the death of the Duke of Marlborough in the previous year, and it lay a little to the west of Münster, under the orders of the Hanoverian General von Spörcke. That officer growing uneasy over Contades's movements, Ferdinand on the 16th of May marched from Ziegenhain, leaving sixteen thousand men under General von Imhoff to protect Hesse, and on the 24th, having effected his junction with Spörcke, cantoned his troops along the Lippe from Coesfeld to Hamm. Meanwhile Contades, detaching a corps of fifteen thousand men under Count d'Armentières to threaten Münster, marched southward from Düsseldorf upon Giessen, there to join Broglie and begin operations against Hesse. Ferdinand, in the faint hope of recalling him to the Rhine, despatched a corps under the Hereditary Prince of Brunswick, a most brilliant officer, to alarm the French garrisons at Düsseldorf and other points on the river; but Contades, adhering to his purpose, pushed forward an advanced corps under M. de Noailles from Giessen to Marburg, evidently intent on prosecuting his march to the north. Contades was in overwhelming force. Noailles's corps at Marburg numbered twenty thousand men, his own at Giessen close on sixty thousand, while Broglie's reserve-corps at Friedberg, a little to the south of Giessen, included close on twenty thousand more. He now sent Broglie forward by Fritzlar upon Cassel, while he himself continued his march due north through Waldeck upon Corbach. Imhoff, fearful of being cut off and unable to defend Cassel, fell back towards Lippstadt; and Broglie having left a force to occupy Cassel, turned westward to rejoin Contades. On the 14th of June the whole were again assembled together, Contades' corps lying a little to the south of Paderborn, and Broglie's at Stadtbergen.
June 11.
June 18.
These movements caused Ferdinand the deepest anxiety. On the 11th of June he concentrated and marched eastward to Büren, where he halted and picked up Imhoff's corps; but even so he was weaker than the enemy, for though he had recalled the Hereditary Prince from Düsseldorf, he had been obliged to leave nine thousand men under General Wangenheim at Dülmen, to watch d'Armentières's designs against Münster. But worse was to come; for on the 18th Broglie's corps, moving up to the right of Contades's, began to edge Ferdinand's left wing back to the westward. Ferdinand, accepting the inevitable, fell back on Lippstadt and crossed the Lippe to Rietberg. His embarrassment was now extreme. He could not divine whether the enemy designed to besiege Lippstadt or Münster or both, or whether they meant to force a battle upon him against greatly superior numbers. He was inclined to risk a battle, seeing that, for all that he could do to prevent it, both fortresses might be taken before his eyes; in which case he must needs cross to the east side of the Weser. So critical did he consider the position that he wrote to King George the Second for instructions, and begged that ships might be ready to transport the garrison in case it should be necessary to evacuate Emden. The King's answer showed the Guelphic loyalty and courage at its noblest. He said that since Ferdinand was inclined to hazard an action he also was ready to take the risk, but that he left his General an absolutely free hand, only assuring him that his confidence in him would be unabated, whatever the result; and, lest Ferdinand should be in any doubt, he caused a second letter to be written to him to the same effect, but in stronger terms even than the first.[351]
June 29.
July 3.
July 8.
July 10.
July 14.
Meanwhile Contades marched up to Paderborn and halted for some days, keeping Ferdinand still in doubt as to his intentions. At last on the 29th he moved northward and pushed his light troops forward to Bielefeld, showing plainly that his true aim was the capture either of Hameln or of Minden on the Weser. Ferdinand therefore recalled Wangenheim's corps from Dülmen to the main army; whereupon, as he had expected, d'Armentières at once advanced to besiege Münster. On the same day Ferdinand himself moved northward and encamped parallel to Contades at Diessen, comforting himself with the reflection that though his enemies might be nearer to Minden than he, he at any rate was nearer to his food-supplies than they.[352] It was, however, extremely difficult for him to obtain intelligence of the French movements, since the two armies were separated by a broad chain of wooded hills; and he consequently hesitated for some days before he decided, on false information of a French advance, to move towards Osnabrück. His intention was to turn eastward from thence, and to take up a position which would render it perilous for the French to attempt the siege either of Hameln or Minden. He had made, however, but one march from Osnabrück when he received the news that Broglie had surprised Minden on the day before, and that the French had thus secured a bridge over the Weser and free access into Hanover. This was a most unpleasant surprise for Ferdinand. For a day he hesitated whether or not to return to Münster, and then decided to fall back to the Lower Weser, so as to save his magazine at Nienburg, and, since the French had set the example of lawlessness at Frankfort, to occupy the Imperial Free Town of Bremen. On the 14th of July accordingly his headquarters were fixed at Stolzenau, between Nienburg and Minden on the Weser, and a detachment was sent to Bremen.
July 17.