You can zoom in on this picture.
text on the sign
Reno's Retreat
Under mounting pressure, Reno abandons the timber. His retreat disintegrates into a rout as pursuing warriors ride in amongst the troopers killing more than 30 soldiers. Indian casualties are few. Lakotas and Cheyennes drive the cavalry across the river and up the steep bluffs to your left. Receiving word of other soldiers downstream (to your right) they abandon Reno to meet the new threat to their village.
quotes on the sign
"We've had a big fight in the bottom, got whipped like hell and I am damned glad to see you!"
-- 2nd Lt. Luther Hare, Co. K, 7th Cavalry
"The Sioux and the Cheyennes charged and the troops ran for the river. The Indians rode right up to them and knocked some off their horses as they were running, and some fell in the river. It was like chasing buffalo... a grand chase."
-- American Horse, Northern Cheyenne