While La Rouerie was adjusting his instruments and bringing the complicated agency to perfection, the invaders came and went, and the signal for action, when they were masters of Chalons, was never given. When volunteers were called out to resist them, men with black cockades went about interrupting the enrolment, and declaring that no man should take arms, except to deliver the king. Their mysterious leader, Cottereau, the first to bear the historic name of Jean Chouan, was La Rouerie's right hand. When the prospect of combination with the Powers was dissolved by Dumouriez, the character of the conspiracy changed, and men began to think that they could fight the Convention single-handed, while its armies were busy on the Rhine and Meuse. Brittany had 200 miles of coast, and as the Channel Islands were in sight, aid could come from British cruisers. La Rouerie, who was a prodigy of inventiveness, and drew his lines with so firm a hand that the Chouannerie, which broke out after his death, lasted ten years and only went to pieces against Napoleon, organised a rising, almost from Seine to Loire, for the spring of 1793. Indeed it is not enough to say that they went down before the genius of Napoleon. The "Petite Chouannerie," as the rising of 1815 was called, contributed heavily to his downfall; for he was compelled to send 20,000 men against it, whose presence might have turned the fortune of the day at Waterloo. But in January 1793 La Rouerie fell ill, the news of the king's death made him delirious, and on the 30th he died. That the explosion might yet take place at the appointed hour, they concealed his death, and buried him in a wood, at midnight, filling the grave with quicklime. The secret was betrayed, the remains were discovered, the accomplices fled, and those who were taken died faithful to their trust.