Wilderness Trek by Zane Grey

The five white avengers, picking a relatively calm stretch, swam their horses across the river. Friday crossed by holding onto King's tail and floating behind. Ormiston, Sterl reflected, had probably assumed that the flooded river was an insurmountable barrier to pursuit. There came a slight change in the temperature, the cool air moderating, and the drizzle increasing to rain. The gray overcast sky darkened. The water level had risen another foot. Owing to the rain, Dann's wagon had not burned up completely, but the canvas cover was partly destroyed, and some of the contents. Half of the load had evidently been carried away. There was no sign of team or harness.

"Ormiston was kinda rarin' to go, huh?" drawled Red.