From day to day the Indians kept up a desultory firing, while Gladwyn took precautions against a long siege. Food was taken from the houses of the inhabitants and placed in a common storehouse. Timber was torn from the walks and used in the construction of portable bastions, which were erected outside the fort. There being danger that the roofs of the houses would be ignited by means of fire-arrows, the French inhabitants of the fort were made to draw water and store it in vessels at convenient points. Houses, fences, and orchards in the neighbourhood were destroyed and levelled, so that skulking warriors could not find shelter. The front of the fort was comparatively safe from attack, for the schooners guarded the river gate, and the Indians had a wholesome dread of these floating fortresses. About the middle of the month the _Gladwyn_ sailed down the Detroit to meet a convoy that was expected with provisions and ammunition from Fort Schlosser. At the entrance to Lake Erie, as the vessel lay becalmed in the river, she was suddenly beset by a swarm of savages in canoes; and Pontiac's prisoner, Captain Campbell, appeared in the foremost canoe, the savages thinking that the British would not fire on them for fear of killing him. Happily, a breeze sprang up and the schooner escaped to the open lake. There was no sign of the convoy; and the _Gladwyn_ sailed for the Niagara, to carry to the officers there tidings of the Indian rising in the west. On May 30 the watchful sentries at Detroit saw a line of bateaux flying the British flag rounding a point on the east shore of the river. This was the expected convoy from Fort Schlosser, and the cannon boomed forth a welcome. But the rejoicings of the garrison were soon stilled. Instead of British cheers, wild war-whoops resounded from the bateaux. The Indians had captured the convoy and were forcing their captives to row. In the foremost boat were four soldiers and three savages. Nearing the fortress one of the soldiers conceived the daring plan of overpowering the Indian guard and escaping to the _Beaver_, which lay anchored in front of the fort. Seizing the nearest savage he attempted to throw him into the river; but the Indian succeeded in stabbing him, and both fell overboard and were drowned. The other savages, dreading capture, leapt out of the boat and swam ashore. The bateau with the three soldiers in it reached the _Beaver_, and the provisions and ammunition it contained were taken to the fort. The Indians in the remaining bateaux, warned by the fate of the leading vessel, landed on the east shore; and, marching their prisoners overland past the fort, they took them across the river to Pontiac's camp, where most of them were put to death with fiendish cruelty.