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In the Fort Waters ground plan the arrangement of post holes seems to make no logical pattern. Yet when we remember that some of the Mission House walls were standing with posts buried therein, probably at 4-foot intervals, the system of posts added by the soldiers becomes intelligible. These posts were added primarily where the adobe walls were damaged or weakened. The most obvious line of posts added by the soldiers occurs in rooms I and K, which served as a hen-house and storeroom. The posts here were placed as close to the adobe wall as possible, sometimes cutting into the face of the wall slightly. It seems apparent that, though these walls were standing after the 1848 fire, they contained no wooden framework. In other words, the missionaries had not deemed it necessary to bury uprights in this part of the house. It had only a dirt floor, making a framework for the attachment of floor joists unnecessary. The soldiers, on the contrary, floored this part of the house and so found it necessary to add upright posts. They had a wood framework set just inside the adobe walls.
In room H the soldiers did extensive remodeling. Apparently the fireplace for this room, if there was one, was beyond repair, for the soldiers built one of their own out of adobe bricks. To do this they laid up an 18-inch-wide adobe wall along 9 feet of the north side of the cellar depression and built their chimney and fireplace against this wall. On the opposite side of the cellar they laid up another wall 10 inches wide, the bricks set in mud mortar. The room was floored with planks, no doubt brought from Dr. Whitman's sawmill 20 miles away on Mill Creek. There was more than 25,000 board feet of lumber at the sawmill at the time of the massacre. (47) As the soldiers had wagons, they must have had lumber in abundance once the Indians had been driven from the valley. There was no evidence of another fireplace in the east end of the building, although this area, too, was floored. The building may well have been completely ceiled with boards. C. W. Cooke, one of the Volunteers, wrote the following while at the Fort:
The corn is silking, and our wheat is ripe for harvest. The boys are cutting today. I think we will have between two hundred and three hundred bushels. I find some half dozen commissions among the wastepapers in the loft.... (48)
His reference to "loft" probably applied to the attic or upper half-story of the reconverted Mission House, though another building could have been indicated.
Part of the east wall of room B either had fallen in 1848 or was removed when the Volunteers dug their cellar. It is likely that a cottonwood log wall similar to the north wall filled in the gap, and there was probably a corner post at the southeast outside corner. However, a large locust tree growing in this area has obliterated signs of the post hole. In the cellar dug by the Volunteers under room B were numerous pieces of cottonwood bark that could well have come from this cottonwood log wall which bordered it on the east. In the cellar, too, were 1-inch-thick pine planks which probably represent flooring for room B above as reconstructed by the Volunteers.
Much of this remodeling must have taken place during the tenure of the sixty-two men who decided to stay on after the main body of the army had returned to the coast. It was they who probably dug the cellar for storage of their crops, and they could well have been the ones to install windows. Evidence of windows, especially in the rear half of the building, is abundant. Much of this glass is of the thin Hudson's Bay Company type, though there is also some that is thicker and similar to modern single- thickness glass. The window glass could easily have been obtained from the Hudson's Bay Company post at Wallula, which was in operation at this time. From the exceptionally fire-warped and amorphous character of much of the window glass, it seems likely that the windows were mostly intact when the building was fired in 1855.49 The installation of glassed windows is a further indication that the sixty-two Volunteers intended to make a permanent establishment out of the Fort. (50)
It might be contended that the flooring of much of the building, the installation of windows, and the establishment of an additional fireplace was the work of the three stockmen who lived in the buildings from about 1852 to 1855. This is hardly logical, as three men would not need the tremendous amount of space afforded by the 99-foot-long building. They would, no doubt, have been satisfied with two or three rooms. The same argument applies to the building of an additional fireplace. On the other hand, the sixty-two Volunteers with ample time on their hands and a plentiful supply of lumber, tools, etc., could easily have accomplished the project. Certainly they needed the space. We know that they set the gristmill in operation, and it is highly possible that they also reconstructed the Mansion House, another adobe building 400 feet east of the Mission House. The Mansion House ruin has yet to be completely excavated.
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