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 wagons. 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. Ernest Mansfeldt did his best to relieve the town. His son, Count Charles, with five thousand troops, had been sent into France, but by sweeping up all the garrisons, he moved with a considerable army towards Gertruydenberg and challenged Maurice to issue out from his lines to fight him. But the prince had no idea of risking a certain success upon the issue of a battle.