After the close of the campaign of 1605 Spinola had gone once more to Spain. On his passage through Paris he had again been received with distinguished favour by that warm ally of the Dutch republic, Henry IV., and on being questioned by that monarch as to his plans for the next campaign had replied that he intended once more to cross the Rhine, and invade Friesland. Henry, convinced that the Genoese would of course not tell him the truth on such an occasion, wrote accordingly to the States-General that they might feel safe as to their eastern frontier. Whatever else might happen, Friesland and the regions adjacent would be safe next year from attack. The immediate future was to show whether the subtle Italian had not compassed as neat a deception by telling the truth as coarser politicians could do by falsehood.

Spinola found the royal finances in most dismal condition. Three hundred thousand dollars a month were the least estimate of the necessary expenses for carrying on the Netherland war, a sum which could not possibly be spared by Lerma, Uceda, the Marquis of the Seven Churches, and other financiers then industriously occupied in draining dry the exchequer for their own uses. Once more the general aided his sovereign with purse and credit, as well as with his sword. Once more the exchange at Genoa was glutted with the acceptances of Marquis Spinola. Here at least was a man of a nature not quite so depraved as that of the parasites bred out of the corruption of a noble but dying commonwealth, and doubtless it was with gentle contempt that the great favourite and his friends looked at the military and financial enthusiasm of the volunteer. It was so much more sagacious to make a princely fortune than to sacrifice one already inherited, in the service of one's country.

Spinola being thus ready not only to fight but to help to pay for the fighting, found his plans of campaigns received with great benignity by the king and his ministers. Meantime there was much delay. The enormous labours thus devolved upon one pair of shoulders by the do-nothing king and a mayor of the palace whose soul was absorbed by his own private robberies, were almost too much for human strength. On his return to the Netherlands Spinola fell dangerously ill in Genoa.

Meantime, during his absence and the enforced idleness of the Catholic armies, there was an opportunity for the republicans to act with promptness and vigour. They displayed neither quality. Never had there been so much sluggishness as in the preparations for the campaign of 1606. The States' exchequer was lower than it had been for years. The republic was without friends. Left to fight their battle for national existence alone, the Hollanders found themselves perpetually subjected to hostile censure from their late allies, and to friendly advice still more intolerable. There were many brave Englishmen and Frenchmen sharing in the fatigues of the Dutch war of independence, but the governments of Henry and of James were as protective, as severely virtuous, as offensive, and, in their secret intrigues with the other belligerent, as mischievous as it was possible for the best-intentioned neutrals to be.

The fame and the popularity of the stadholder had been diminished by the results of the past campaign. The States-General were disappointed, dissatisfied, and inclined to censure very unreasonably the public servant who had always obeyed their decrees with docility. While Henry IV. was rapidly transferring his admiration from Maurice to Spinola, the disagreements at home between the Advocate and the Stadholder were becoming portentous.

There was a want of means and of soldiers for the new campaign. Certain causes were operating in Europe to the disadvantage of both belligerents. In the south, Venice had almost drawn her sword against the pope in her settled resolution to put down the Jesuits and to clip the wings of the church party, before, with bequests and donations, votive churches and magnificent monasteries, four-fifths of the domains of the republic should fall into mortmain, as was already the case in Brabant.

Naturally there was a contest between the ex-Huguenot, now eldest son of the Church, and the most Catholic king, as to who should soonest defend the pope. Henry offered thorough protection to his Holiness, but only under condition that he should have a monopoly of that protection. He lifted his sword, but meantime it was doubtful whether the blow was to descend upon Venice or upon Spain. The Spanish levies, on their way to the Netherlands, were detained in Italy by this new exigency. The States-General offered the sister republic their maritime assistance, and notwithstanding their own immense difficulties, stood ready to send a fleet to the Mediterranean. The offer was gratefully declined, and the quarrel with the pope arranged, but the incident laid the foundation of a lasting friendship between the only two important republics then existing. The issue of the Gunpowder Plot, at the close of the preceding year, had confirmed James in his distaste for Jesuits, and had effected that which all the eloquence of the States-General and their ambassador had failed to accomplish, the prohibition of Spanish enlistments in his kingdom. Guido Fawkes had served under the archduke in Flanders.

Here then were delays additional to that caused by Spinola's illness. On the other hand, the levies of the republic were for a season paralysed by the altercation, soon afterwards adjusted, between Henry IV. and the Duke of Bouillon, brother-in-law of the stadholder and of the Palatine, and by the petty war between the Duke and Hanseatic city of Brunswick, in which Ernest of Nassau was for a time employed.

During this period of almost suspended animation the war gave no signs of life, except in a few spasmodic efforts on the part of the irrepressible Du Terrail. Early in the spring, not satisfied with his double and disastrous repulse before Bergen-op-Zoom, that partisan now determined to surprise Sluy's. That an attack was impending became known to the governor of that city, the experienced Colonel Van der Noot. Not dreaming, however, that any mortal—even the most audacious of Frenchmen and adventurers—would ever think of carrying a city like Sluy's by surprise, defended as it was by a splendid citadel and by a whole chain of forts and water-batteries, and capable of withstanding three months long, as it had so recently done, a siege in form by the acknowledged master of the beleaguering science, the methodical governor event calmly to bed one fine night in June. His slumbers were disturbed before morning by the sound of trumpets sounding Spanish melodies in the streets, and by a, great uproar and shouting. Springing out of bed, he rushed half-dressed to the rescue. Less vigilant than Paul Bax had been the year before in Bergen, he found that Du Terrail had really effected a surprise. At the head of twelve hundred Walloons and Irishmen, that enterprising officer had waded through the drowned land of Cadzand, with the promised support of a body of infantry under Frederic Van den Berg, from Damm, had stolen noiselessly by the forts of that island unchallenged and unseen, had effected with petards a small breach through the western gate of the city, and with a large number of his followers, creeping two and two through the gap, had found himself for a time master of Sluys.

The profound silence of the place had however somewhat discouraged the intruders. The whole population were as sound asleep as was the excellent commandant, but the stillness in the deserted streets suggested an ambush, and they moved stealthily forward, feeling their way with caution towards the centre of the town.