Steps were taken during the summer of 1820 to obtain the necessary material. A saw mill was needed to make the lumber with which the interior of the buildings would be finished and the furniture constructed. As the water in Minnehaha Creek was very low that year, it was decided to erect the mill at the Falls of St. Anthony. Some men were sent up the Mississippi River to Rum River to examine the timber, and during the winter of 1820-1821 a party of soldiers was employed in cutting logs and dragging them to the river bank. With the coming of spring the logs were floated down to the Falls of St. Anthony, where they were sawed into lumber and then hauled to the fort by teams.[80] The progress made on the building was slow. On the tenth of September, 1820, the cornerstone was laid.[81] More than a year later, on November 7, 1821, Colonel Snelling wrote to the Indian agent, Lawrence Taliaferro, that "nothing new has occurred since my return excepting that the other stone barrack is up & the rafters on."[82] The fort was partially occupied, probably in the fall of 1822, before all the surrounding wall had been completed.[83] But it is evident that most of the fort was finished by July, 1823, for at that time the troops erected the Indian Council House.[84] In the meantime other events had been occurring. On July 31, 1820, Governor Cass of Michigan Territory, who had been on an exploring expedition to the upper Mississippi, passed down the river and remained with the troops until the morning of August 2nd. A council was held with the Indians, during which a peace was made between the Sioux and the Chippewas. That the garrison had been busy at duties other than erecting buildings is evident from the fact that Governor Cass found ninety acres planted with corn and potatoes and wheat. From the garden green peas had been obtained as early as June 15th, and green corn on July 20th.[85] In accordance with the plans outlined for the year 1820 it was proposed to open a road between Council Bluff and the new post on the upper Mississippi. To survey the route Captain Stephen Watts Kearny led a party which consisted of four other officers, fifteen soldiers, four servants, an Indian guide and his wife and papoose, eight mules, and seven horses. The route led from Council Bluff across what is now the northern and northwestern part of the State of Iowa to Lake Pepin, and then along the Mississippi to the new post. From July 25th to July 29th they remained with Leavenworth's men, visiting the Falls of St. Anthony, examining the country, and on July 26th going with Lieutenant Green and Miss Gooding to the east side of the Mississippi. Here Lieutenant Green and Miss Gooding were married by Colonel Leavenworth, who as Indian agent for the "Northwest Territory" could perform his duties on the east bank of the river, but not on the west, which was in the Missouri Territory.[86]