As the infantry and cavalry moved away from the shore the wagons came down the decline, the mules braying with excitement at the sight of the water gleaming through the green foliage of the cottonwoods and the verdant acres of rich grass that stretched along the river-side. Brakes were put on and wheels double-locked, until the harness could be stripped off and the half-frantic animals set free to take a turn in the river.
Sheep and oxen plunged down the banks and stood leg-deep in the current while they drank the grateful water. A few moments later all the refreshed animals were cropping the generous grass. As I was going to Captain Bayard I observed Brenda Arnold taking the odometer from its wheel and making an entry in a note-book. Approaching her, I asked: "Why are you doing that, Miss Brenda?"
"I promised Mr. Frank I would do it until he and Mr. Henry return," was her answer.
"Promised Frank? Where has he gone?"
"Gone to find his brother."
"And you knew what you are telling me when we were exchanging oxen this morning?"
"Yes, sir."
"Why did you not tell me?"
"Mr. Frank said I must not before we arrived here."
"Have you no idea of the fearful danger in which he has placed himself?"