But I found I was mistaken.

The Pawnee scouts, unlike regular soldiers, had not waited for the formality of orders from their officers.

Jumping their ponies bareback and putting ropes in the animals' mouths, they had hurried to the place from which the shots came and got there before I did.
The marauders proved to be a party of fifty or more Sioux, who had endeavored to stampede our animals.

They were painfully surprised to find their inveterate enemies, the Pawnees, coming toward them at full gallop.

They had no idea the Pawnees were with the command.