The enterprise was kept as secret as possible, yet not so close as to prevent the authorities of Berne obtaining some inkling of their intentions. Three confidential messengers were first dispatched to the valleys to ascertain the disposition of the population, and more particularly to examine the best route by which an invasion might be made. On their return with the necessary information, the plan was settled by Javanel, as it was to be carried out by Arnaud. In the meantime, the magistrates of Geneva, having obtained information as to the intended movement, desirous of averting the hostility of France and Savoy, required Javanel to leave their city, and he at once retired to Ouchy, a little farther up the lake.

The greatest difficulty experienced by the Vaudois in carrying out their enterprise was the want of means. They were poor, destitute refugees, without arms, ammunition, or money to buy them. To obtain the requisite means, Arnaud made a journey into Holland, for the purpose of communicating the intended project to William of Orange. William entered cordially into the proposed plan, recommended Arnaud to several Huguenot officers, who afterwards took part in the expedition, supplied him with assistance in money, and encouraged him to carry out the design. Several private persons in Holland—amongst others the post-master-general at Leyden—also largely contributed to the enterprise.

At length all was ready. The men who intended to take part in the expedition came together from various quarters. Some came from Brandenburg, others from Bavaria and distant parts of Switzerland; and among those who joined them was a body of French Huguenots, willing to share in their dangers and their glory. One of their number, Captain Turrel, like Arnaud, a native of Die in Dauphiny, was even elected as the general of the expedition. Their rendez-vous was in the forest of Prangins, near Nyon, on the north bank of the Lake of Geneva; and there, on the night of the 16th of August, 1689, they met in the hollow recesses of the wood. Fifteen boats had been got together, and lay off the shore. After a fervent prayer by the pastor-general Arnaud, imploring a blessing upon the enterprise, as many of the men as could embark got into the boats. As the lake is there at its narrowest, they soon rowed across to the other side, near the town of Yvoire, and disembarked on the shore of Savoy. Arnaud had posted sentinels in all directions, and the little body waited the arrival of the remainder of their comrades from the opposite shore. They had all crossed the lake by two o'clock in the morning; and about eight hundred men, divided into nineteen companies,[109] each provided with its captain, were now ready to march.

At the very commencement, however, they met with a misfortune. One of the pastors, having gone to seek a guide in the village near at hand, was seized as a prisoner by the local authorities, and carried off. On this, the Vaudois, seeing that they were treated as enemies, sent a party to summon Yvoire to open its gates, and it obeyed. The lord of the manor and the receiver of taxes were taken as hostages, and made to accompany the troop until they reached the next commune, when they were set at liberty, and replaced by other hostages.

When it became known that the little army of Vaudois had set out on their march, troops were dispatched from all quarters to intercept them and cut them off; and it was believed that their destruction was inevitable. "What possible chance is there," asked the Historic Mercury of the day, "of this small body of men penetrating to their native country through the masses of French and Piedmontese troops accumulating from all sides, without being crushed and exterminated?" "It is impossible," wrote the Leyden Gazette, "notwithstanding whatever precautions they may take, that the Vaudois can extricate themselves without certain death, and the Court of Savoy may therefore regard itself safe so far as they are concerned."

No sooner had the boats left the shore at Nyon for the further side of the lake than the young seigneur of Prangins, who had been watching their movements, rode off at full speed to inform the French resident at Geneva of the departure of the Vaudois; and orders were at once dispatched to Lyons for a strong body of cavalry to march immediately towards Savoy to cut them off. But the Vaudois had well matured their plans, and took care to keep out of reach of the advancing enemy. Their route at first lay up the valleys towards the mountains, whose crests they followed, from glacier to glacier, in places almost inaccessible to regular troops, and thus they eluded the combined forces of France and Savoy, which, vainly endeavoured to bar their passage.

The first day's march led them into the valley of the Arve, by the Col de Voirons, from which they took their last view of the peaceful Lake of Geneva; thence they proceeded by the pyramidal mountain called the Mole to the little town of Viu, where they rested for two hours, starting again by moonlight, and passing through St. Joire, where the magistrates brought out a great cask of wine, and placed it in the middle of the street for their refreshment. The little army, however, did not halt there, but marched on to the bare hill of Carman, where, after solemn prayer, they encamped about midnight, sleeping on the bare ground. Next day found them in front of the small walled town of Cluse, in the rocky gorge of the Arve. The authorities shut the gates, on which the Vaudois threatened to storm the place, when the gates were opened, and they marched through the town, the inhabitants standing under arms along both sides of the street. Here the Vaudois purchased a store of food and wine, which they duly paid for.

They then proceeded on to Sallanches, where resistance was threatened. They found a body of men posted on the wooden bridge which there separated the village of St. Martin from Sallanches; but rushing forward, the defenders of the bridge fled, and the little army passed over and proceeded to range themselves in order of battle over against the town, which was defended by six hundred troops. The Vaudois having threatened to burn the town, and kill the hostages whom they had taken on the slightest show of resistance, the threat had its effect, and they were permitted to pass without further opposition, encamping for the night at a little village about a league further on. And thus closed the second day's march.

The third day they passed over the mountains of Lez Pras and Haute Luce, seven thousand feet above the sea-level, a long and fatiguing march. At one place the guide lost his way, and rain fell heavily, soaking the men to the skin. They spent a wretched night in some empty stables at the hamlet of St. Nicholas de Verose; and started earlier than usual on the following morning, addressing themselves to the formidable work of climbing the Col Bonhomme, which they passed with the snow up to their knees. They were now upon the crest of the Alps, looking down upon the valley of the Isère, into which they next descended. They traversed the valley without resistance, passing through St. Germain and Scez, turning aside at the last-mentioned place up the valley of Tignes, thereby avoiding the French troops lying in wait for them in the neighbourhood of Moutiers, lower down the valley of the Isère. Later in the evening they reached Laval, at the foot of Mont Iseran; and here Arnaud, for the first time during eight days, snatched a few hours' sleep on a bed in the village.

The sixth day saw the little army climbing the steep slopes of Mont Iseran, where the shepherds gave them milk and wished them God-speed; but they warned them that a body of troops lay in their way at Mont Cenis. On they went—over the mountain, and along the crest of the chain, until they saw Bonneval in the valley beneath them, and there they descended, passing on to Bessant in the valley of the Arc, where they encamped for the night.