"Running from the cover of brush to the trenches was no easy matter," says one Rough Rider who was there. "We had dug the trenches in a hurry, and had no passages from the rear leading to them. All we could do was to wait for a signal, and then rush, and when we did that, the Spaniards would open a hot fire and keep it up for perhaps fifteen minutes. The sun was enough to turn a man's brain, and more than one poor fellow caught a fever there that proved fatal to him."