38 EXPLORATION OF THE COUNTRY BETWEEN 
The sketches must be excused for want of neatness, as they were 
made with the least possible facilities. 
In what I have so far accomplished, I have been essentially aided 
by Mr. Paul Carrey. 
Whatever may be the comparative defects in the site of Fort Pierre 
for a military post, it is evident that it is the only one in this part of 
the country that could be occupied this year as a depot, and the labor 
that will have been expended before another season comes around may 
render the removal of the post an affair of doubtful expediency. 
. am, sir, your obedient servant, 
fae ; 
Lieutenant Topographical Engineers. 
Major O. F. Wrysurp, 
Assistant Adjutant General, 
Of Sioux Expedition. 
APPENDIX ¢. 
Report of September 4, 1855, and sketch of Battle Ground at Blue 
Water Creek. 
rally abrupt and three to four feet high, requiring care when 
proached on horseback. It will be seen the stream 
Sem, 
Pata Peat 
