Hitherto they had not conducted themselves otherwise than well. Stoutenburg, who now dwelt in his house with his mother, was of a dark, revengeful, turbulent disposition. In the career of arms he had a right to look forward to success, but thus condemned to brood in idleness on the cruel wrongs to himself and his house it was not improbable that he might become dangerous.

Years long he fed on projects of vengeance as his daily bread. He was convinced that his personal grievances were closely entwined with the welfare of the Commonwealth, and he had sworn to avenge the death of his father, the misery of his mother, and the wrongs which he was himself suffering, upon the Stadholder, whom he considered the author of all their woe. To effect a revolution in the government, and to bring back to power all the municipal regents whom Maurice had displaced so summarily, in order, as the son believed, to effect the downfall of the hated Advocate, this was the determination of Stoutenburg.

He did not pause to reflect whether the arm which had been strong enough to smite to nothingness the venerable statesman in the plenitude of his power would be too weak to repel the attack of an obscure and disarmed partisan. He saw only a hated tyrant, murderer, and oppressor, as he considered him, and he meant to have his life.

He had around him a set of daring and desperate men to whom he had from time to time half confided his designs. A certain unfrocked preacher of the Remonstrant persuasion, who, according to the fashion of the learned of that day, had translated his name out of Hendrik Sleet into Henricus Slatius, was one of his most unscrupulous instruments. Slatius, a big, swarthy, shag-eared, beetle-browed Hollander, possessed learning of no ordinary degree, a tempestuous kind of eloquence, and a habit of dealing with men; especially those of the humbler classes. He was passionate, greedy, overbearing, violent, and loose of life. He had sworn vengeance upon the Remonstrants in consequence of a private quarrel, but this did not prevent him from breathing fire and fury against the Contra-Remonstrants also, and especially against the Stadholder, whom he affected to consider the arch-enemy of the whole Commonwealth.

Another twelvemonth went by. The Advocate had been nearly four years in his grave. The terrible German war was in full blaze. The Twelve Years' Truce had expired, the Republic was once more at war, and Stoutenburg, forbidden at the head of his troop to campaign with the Stadholder against the Archdukes, nourished more fiercely than ever his plan against the Stadholder's life.

Besides the ferocious Slatius he had other associates. There was his cousin by marriage, van der Dussen, a Catholic gentleman, who had married a daughter of Elias Barneveld, and who shared all Stoutenburg's feelings of resentment towards Maurice. There was Korenwinder, another Catholic, formerly occupying an official position of responsibility as secretary of the town of Berkel, a man of immense corpulence, but none the less an active and dangerous conspirator.

There was van Dyk, a secretary of Bleiswyk, equally active and dangerous, and as lean and hungry as Korenwinder was fat. Stoutenburg, besides other rewards, had promised him a cornetcy of cavalry, should their plans be successful. And there was the brother-in-law of Slatius, one Cornelis Gerritaen, a joiner by trade, living at Rotterdam, who made himself very useful in all the details of the conspiracy.

For the plot was now arranged, the men just mentioned being its active agents and in constant communication with Stoutenburg.

Korenwinder and van Dyk in the last days of December 1622 drew up a scheme on paper, which was submitted to their chief and met with his approval. The document began with a violent invective against the crimes and tyranny of the Stadholder, demonstrated the necessity of a general change in the government, and of getting rid of Maurice as an indispensable preliminary, and laid down the means and method of doing this deed.

The Prince was in the daily habit of driving, unattended by his body-guard, to Ryswyk, about two miles from the Hague. It would not be difficult for a determined band of men divided into two parties to set upon him between the stables and his coach, either when alighting from or about to enter it—the one party to kill him while the other protected the retreat of the assassins, and beat down such defence as the few lackeys of the Stadholder could offer.