It was hard work for several reasons--hard for Estelle to maintain a steady and firm posture under the moving weight, hard for Katherine to wield the mallet with unerring strokes, hard to force the sharpened point into the well-packed bed of the lake. Katherine's right arm became very tired before she had driven the stake deep enough to insure a reasonable degree of firmness. While this task was being performed, the girls were still protected against the danger of being swept into deeper water by the ropes looped around their waists and held at the other ends by some of the girls on the sandy beach.