Parma himself was ill from annoyance and disappointment. The army with which he might have completed the conquest of the Netherlands had, in opposition to his entreaties and prayers, been frittered away by Philip's orders in useless expeditions in France, while the young and active generals of the Dutch and English armies were snatching town after town from his grasp, and consolidating the Netherlands, so recently broken up by Spanish strongholds, into a compact body, whose increasing wealth and importance rendered it every day a more formidable opponent. It is true that Parma had saved first Paris and afterwards Rouen for the League, but it was at the cost of loosening Philip's hold over the most important outpost of the Spanish dominions.
In the following spring Parma was again forced to march into France with 20,000 men, and Maurice, as soon as the force started, prepared to take advantage of its absence. With 6000 foot and 2000 horse he again appeared at the end of May before Steenwyk. This town was the key to the province of Drenthe, and one of the safeguards of Friesland; it was considered one of the strongest fortresses of the time. Its garrison consisted of sixteen companies of foot and some cavalry, and 1200 Walloon infantry, commanded by Lewis, the youngest of the Counts de Berg, a brave lad of eighteen years of age.
In this siege, for the first time, the spade was used by soldiers in the field. Hitherto the work had been considered derogatory to troops, and peasants and miners had been engaged for the work; but Prince Maurice had taught his soldiers that their duty was to work as well as fight, and they now proved the value of his teaching.
The besieged made several successful sorties, and Sir Francis Vere had been severely wounded in the leg. The cannonade effected but little damage on the strong walls; but the soldiers, working night and day, drove mines under two of the principal bastions, and constructed two great chambers there; these were charged, one with five thousand pounds of powder, the other with half that quantity. On the 3d of July the mines were sprung. The bastion of the east gate was blown to pieces and the other bastion greatly injured, but many of the Dutch troops standing ready for the assault were also killed by the explosion.
The storming parties, however, rushed forward, and the two bastions were captured. This left the town at the mercy of the besiegers. The next day the garrison surrendered, and were permitted to march away. Three hundred and fifty had been killed, among them young Count Lewis Van der Berg, and two hundred had been left behind, severely wounded, in the town. Between five and six hundred of the besiegers were killed during the course of the siege. The very day after the surrender of Steenwyk Maurice marched away and laid siege to Coevorden. This city, which was most strongly fortified, lay between two great swamps, between which there was a passage of about half a mile in width.
Another of the Van der Bergs, Count Frederick, commanded the garrison of a thousand veterans. Verdugo sent to Parma and Mondragon for aid, but none could be sent to him, and the prince worked at his fortifications undisturbed. His force was weakened by the withdrawal of Sir Francis Vere with three of the English regiments, Elizabeth having sent peremptory orders that this force should follow those already withdrawn to aid Henry of Navarre in Brittany. Very unwillingly Vere obeyed, and marched to Doesburg on the Yssel. But a fortnight after he arrived there, while he was waiting for ships to transport him to Brittany the news came to him that Verdugo, having gathered a large force together, was about to attack Prince Maurice in his camp, and Vere at once started to the prince's aid.
On the night of the 6th of September, Verdugo, with 4000 foot and 1800 cavalry, wearing their shirts outside their armour to enable them to distinguish each other in the dark, fell upon Maurice's camp. Fortunately the prince was prepared, having intercepted a letter from Verdugo to the governor of the town. A desperate battle took place, but at break of day, while its issue was still uncertain, Vere, who had marched all night, came up and threw himself into the battle. His arrival was decisive. Verdugo drew off with a loss of 300 killed, and five days later Coevorden surrendered, and Prince Maurice's army went into winter quarters.
A few weeks later Parma died, killed by the burden Philip threw upon him, broken down by the constant disappointment of his hopes of carrying his work to a successful end, by the incessant interference of Philip with his plans, and by the anxiety caused by the mutinies arising from his inability to pay his troops, although he had borrowed to the utmost on his own possessions, and pawned even his jewels to keep them from starvation. He was undoubtedly the greatest commander of his age, and had he been left to carry out his own plans would have crushed out the last ember of resistance in the Netherlands and consolidated the power of Spain there.
He was succeeded in his post by the Archduke Albert, but for a time Ernest Mansfeldt continued to command the army, and to manage the affairs in the Netherlands. In March, 1593, Prince Maurice appeared with his army in front of Gertruydenberg. The city itself was an important one, and its position on the Maas rendered it of the greatest use to the Spaniards, as through it they were at any moment enabled to penetrate into the heart of Holland. Gertruydenberg and Groningen, the capital of Friesland, were now, indeed, the only important places in the republic that remained in possession of the Spaniards. Hohenlohe with a portion of the army established himself to the east of the city, Maurice with its main body to the west.
Two bridges constructed across the river Douge afforded a means of communication between two armies, and plank roads were laid across the swamps for the passage of baggage waggons. Three thousand soldiers laboured incessantly at the works, which were intended not only to isolate the city, but to defend the besiegers from any attack that might be made upon them by a relieving army. The better to protect themselves, miles of country were laid under water, and palisade work erected to render the country impregnable by cavalry.