The stormy season prevented Rogers from advancing farther. Michilimackinac and the three remoter posts of Ste. Marie, La Baye (Green Bay), and St. Joseph remained in the hands of the French until the next year. The interior posts of the Illinois country were also retained by the French, but the British conquest of America was completed. The victory of England and the transfer of the French strongholds to British commanders were a terrible and portentous blow to the Indian. He could not fail to foresee therein dire results to his race. His prophetic vision read the handwriting on the wall! Expressions and signs of discontent and apprehension began to be audible among the Indian tribes; "from the Potomac to Lake Superior, and from the Alleghanies to the Mississippi, in every wigwam and hamlet of the forest, a deep-rooted hatred of the English increased with rapid growth." When the French occupied the military posts of the lakes and the rivers they freely supplied the neighboring Indians with weapons, clothing, provisions, and fire-water. The sudden cessation of these bounties was a grievous and significant calamity.

The English fur-trader and incomer was rude and coarse and domineering as compared with the agreeable and docile Frenchman. Worse and more alarming than all was the intrusion into the forest solitude and hunting-ground of the Indian by the English settler, who regarded the red man as having no rights he was bound to respect. While the rivalry between the two white nations was in progress, the red man was courted by each as holding in large degree the balance of power. But the war over, the ascendant Briton no longer regarded the Indians as necessary allies, and they were in large measure treated with indifference and injustice. The hostility of the Indian against the British was, of course, assiduously promoted by the French, who saw in it trouble for the British, possibly a regaining of their lost ground. The warlike and revengeful spirit of the Indian began to give itself vent. The smouldering fires were bound to burst forth. During the years 1761 and 1762 plots were hatched in various tribes to stealthily approach, and, by attack or treacherous entrance, destroy the posts of Detroit, Fort Pitt, and others. These plots were severally discovered in time to forestall their attempt. Indian indignation reached its height when in 1763 it was announced to the tribes that the King of France had ceded all their (Indian) country to the King of England, without consulting them in the matter. At once a plot was contrived, "such as was never before or since conceived or executed by North American Indians."

It was determined and planned to make an assault upon all the British posts on the same day; "then, having destroyed the garrisons, to turn upon the defenceless frontier and ravage and lay waste the white settlements." It was fondly believed by thousands of braves that then the British might be exterminated, or at least driven to the seaboard and confined to their coast settlements. It was the great chief, Pontiac, who if he did not originally instigate, fostered, directed, and personally commanded this secretly arranged universal movement. His mastermind comprehended the importance and necessity of combined and harmonious effort. He proposed to unite all the tribes into one confederacy for offensive operations. At the close of 1762 he despatched ambassadors to the different nations—to the tribes of the North on the Lakes; to the northwest, the head-waters of the Mississippi and south to its mouth; to the east and the southeast. The Indians thus enlisted and banded together against the British comprised, "with few unimportant exceptions, the whole Algonquin stock." Especially were the Ohio tribes solicited and secured; the Shawanoes, the Miamis, the Wyandots, and the Delawares. The Senecas were the only members of the Iroquois confederacy that joined the league. The onslaught was to be made in the month of May, 1763, the tribes to rise simultaneously at the various points and each tribe destroy the British garrison in its neighborhood.

It was a vast scheme, worthy the brain and courage of the greatest general and shrewdest statesman. The plan was divulged by individual Indians to officers at two or three of the posts, but was either disbelieved or its importance ignored. While this gigantic and almost chimerical plot was being developed by Pontiac and his associate chiefs, the treaty of peace between France and England was signed at Paris, February 10, 1763. By this compact France yielded to England all her territory north of the Great Lakes and the St. Lawrence and east of the Mississippi. The Spanish possessions on the Gulf of Mexico were ceded to England, the territory west of the Mississippi going to Spain. France was left no foothold in North America. While the powers of England, France, and Spain were in the French capital arranging this result, as Parkman remarks, "countless Indian warriors in the American forests were singing the war-song and whetting their scalping-knives."

The chief centre of Indian activity and the main point of attack was the post of Detroit, the Western head-quarters of the British government. Pontiac was personally to strike the first blow. The rendezvous of his painted and armed warriors was to be the banks of the little river Ecorces, which empties into the Detroit River a few miles below the Fort, now the city of Detroit. It was April 27th when the assembled warriors listened to the final war-speech of the great chief.

Pontiac was an orator of a high order, fierce and impassioned in style. He presented at length the injustice of the British as compared with that of the French; he set forth the danger to his race from the threatened supremacy of the British power; he predicted the awakening of "their great father the King of France," during whose sleep the English had robbed the Indian of his American possessions. In passionate appeals he aroused the vengeance and superstition of his people and warned them that the white man's civilization was poisoning and annihilating the red race. In his dramatic way he related to the superstitious Indians a dream wherein the Great Spirit sent his message that they were to cast aside the weapons, the utensils of civilization, and the "deadly rum" of the white men, and, with aid from the Great Spirit, drive the dogs in red from every post in their (Indian) country. He revealed his plans of destruction of the whites and the details of the plot to secure Detroit. He and a few of his chosen chiefs were to visit the Fort, under pretence of a peaceful visit, gain admittance, seek audience with Major Henry Gladwyn, the commandant, and his officers, and then at an agreed signal the chiefs were to draw their weapons, previously concealed beneath their blankets, raise the war-whoop, rush upon the officers and strike them down.

The Indian forces waiting meanwhile at the gate were then to assail the surprised and half-armed soldiers. Thus through this perfidious murder Detroit would fall an easy prey to the savages and Pontiac's conspiracy have a successful inauguration. His plan was approved. Just below Detroit, on the same side of the river, was a Pottawottomi village; across the river some three miles up the current was an Ottawa village; on the same eastern side about a mile below Detroit was the Wyandot village. Along each side of the river for two or three miles were houses of the French settlers. "The king and lord of all this country," as Major Rogers called Pontiac, had located one of his homes, where he spent the early summer, on a little island (Île à Pêche) at the opening of Lake St. Clair. Here he had a small oven-shaped cabin of bark and rushes. Here he dwelt with his squaws and children, and here doubtless he might often have been seen, lounging, Indian style, half naked, on a rush mat or bear-skin.

The number of warriors under the command of Pontiac is variously estimated from six hundred to two thousand. The garrison consisted of one hundred twenty soldiers, eight officers, and about forty others capable of bearing arms. Two armed schooners, The Beaver and The Gladwyn, were anchored in the river near the Fort. Pontiac's plot was revealed to Gladwyn the night before its proposed execution by an Ojibwa girl from the Pottawottomi village.[50] Gladwyn, thus warned, was forearmed. Pontiac and his six chiefs were admitted to the council-chamber. Pontiac began the harangue of peace and friendly palaver and was about to give the preconcerted signal when Gladwyn raised his hand and the sound of clashing arms and drum-beating was heard without. Pontiac feared he was foiled, and announcing that he would "call again," next time with his squaws and children, he and his party withdrew.