The Indians appeared in groups, on the bank of the river below Detroit; a few shots from the gunboats caused them to disperse. The Indians did not leave Detroit till the boats containing the troops were halfway across the river. Just before we landed on the American side, the inhabitants hoisted the United States' flag amid the acclamations of thousands. We were received by the inhabitants with demonstrations of unfeigned joy. They had suffered all that civilized and savage tyranny could inflict, save death. The Indians had lived at free quarters for several months. It was natural for them to hail us as deliverers. The enemy had set fire to the fort, but the walls and picketing remained entire. The public store, a long brick building near the wharf was injured only in the roof which our men soon repaired. In the course of the night there was an alarm in camp, the fires were extinguished, and the men ordered to lie on their arms. On the 30th Col. Johnson's regiment arrived from Fort Meigs, they immediately commenced the passage of the river in boats.--Gen. M'Arthur with the mass of the regular troops was charged with the defence of Detroit. It was the general opinion of the inhabitants that there were 1000 Indian warriors, under Marpot and Split Log, lurking in the woods between the river Rouge and Huron of Lake St. Clair. The friendly Indians had taken several prisoners in the immediate vicinity of Detroit. On the 2d of October every arrangement was completed for pursuing the retreating British army up the Thames. The force selected for this service were the mounted regiment of Col. Johnson, three companies of Col. Ball's legion and the principal part of Governor Shelby's volunteers. From Sandwich to the Moravian Towns is eighty four miles. We found the roads for the most part good. The country is perfectly level. The advance of the troops was rapid--so much so that we reached the river Riscum, one hundred and twenty-five miles from Sandwich, in the evening. The enemy had neglected to destroy the bridge. Early in the morning of the 3d, the general proceeded with Johnson's regiment, to prevent the destruction of the bridges over the different streams that fall into Lake St. Clair and the Thames. These streams are deep and muddy, and are unfordable for a considerable distance into the country. A lieutenant of dragoons and thirteen privates, who had been sent back by Gen. Proctor to destroy the bridges, were made prisoners near the Thames; from them the general learnt that the enemy had no certain information of our advance.