He climbed back onto the seat and picked up the reins. The mules stepped forward, then suddenly sidewise. Joe's heart missed a beat and he let them go, for now he saw why he had had an instinctive fear of this river. When the other wagons crossed, it must have been low, perhaps little more than a trickle. But, doubtless due to upcountry rains, now it was in flood and had undercut its banks. Where other wagons had found a safe ford, he found only a treacherous shell of dirt. The wagon lurched sickeningly, threatened to tip, then came out of a hole into which the right front wheel had fallen. The mules strained with all their strength, swung back toward solid ground, and Joe breathed his thanks because he had mules. Horses or oxen would have gone right ahead, leaving the wagon hopelessly mired and perhaps drowning themselves. Mules did their own thinking. For a brief second that lengthened into eternity, and while the mules strove mightily to move it, the wagon stopped. Then it was moving again and Joe felt sick. The right front wheel had gone down, and the right front wheel was still down while the wagon dragged on its axle. The wheel was broken, and he had a spare for everything except wheels. Then he stifled his fright. The mules came to safe ground and stopped, their sides heaving. Joe stepped from the wagon to see what he knew he would find. The rim was broken, and the spokes. There was no possibility of repairing the wheel. Tad joined him, then Emma and Barbara. "Why don't you fix it, Pa?" Tad asked. "I can't." He looked levelly at Emma. "Are you afraid to stay with the youngsters for a while?" She looked at him, unable to answer. "I'll leave the rifle with Tad." "What are you going to do, Joe?" "The only thing I can do, ride back to that abandoned wagon we saw and take a wheel from it. The mules won't be hauling a wagon and I should be able to make time. If I leave now, I can get a long way before dark." She gritted her teeth. What must be, must be. "I'll fix you some lunch." "Thank you, darling. Tad, walk with me, will you?" "Sure, Pa." Tad beside him, Joe walked up the river bank. He swallowed hard. If there were a fort, or even a house--But there wasn't any and he couldn't build any. Joe turned to his son. He looked down in the wide, trusting eyes, and he felt both proud and fearful. "Tad, you must take over." "Sure, Pa." His face was eager. "I don't think you'll have any trouble. But if you do, if anyone at all comes, don't try to defend the wagon. Walk away and let them have it." "Suppose they come after us?" "Then," Joe said grimly, "shoot and shoot to kill!" Tad blinked once, and then he said soberly, "Yes, Pa." Joe took from his box the tools he needed, and strapped them to the horse mule's harness. Emma pressed a parcel into his hands. "Here's food." Suddenly her eyes misted over, and her mouth trembled, and then stopped. "You--you watch yourself, Joe. Be careful." She managed a smile.