Later General Hill drove 450 from the town of Torin, forcing them back to Guaymas, thus clearing the southern part of the State. After his successes in this locality, he joined General Obregon, in the hope of attacking Generals Ojeda and Barron. The following move of the Constitutionalists is one of the most effective of the whole campaign. It was a decisive battle for the main water supply, which the troops were badly in need of and took place at Santa Maria. The plans of Generals Obregon, Alvarado and Dieguez once more proved very effective. The Federals, finding the water supply taken, were forced to assume the offensive. They felt confident of success, and burdened themselves with all kinds of unnecessary impediments. But the Constitutionalists were not to be taken by surprise; instead of waiting for the Federals to advance, they went out to meet them: by this manœuvre the Federals found themselves face to face with the Constitutionalists much sooner than they had expected. For the Federals, it was a fight for existence. They were face to face with death from thirst, and felt that unless they regained the wells a miserable death would be their lot. With them, it was not a fight for the honor of Huerta--they fought from sheer desperation. Under such conditions, the battle could not last long. Four desperate assaults were made upon the Constitutionalists’ positions, and were repulsed. One of these assaults lasted more than twenty-four hours, resulting in a hand to hand fight. In those hand to hand frays one could not help admiring the remarkable way in which the Yaquis handled their daggers. The Federal army was wiped out completely in a very short time. While much credit is due to the soldiers who fought in the ranks of the Constitutionalists, many of their victories are due to the remarkable strategy of the generals. One instance will illustrate this. General Alvarado, realizing the terrible thirst of the Federal soldiers, drove them into a watermelon field. He knew fully well the result of such a move. No sooner had they reached the watermelon field, when all the fighting on their part ceased. The Federal officers had to force them to fight at the point of their bayonets, but even that did little good. Once they had entered the melon field, they were the easy victims of the Constitutional fire. At the close of the battle, General Ojeda fled from the scene, abandoning his officers and soldiers. He was followed by the officers, while a small group of soldiers, braver than their chiefs, kept on fighting till they reached Guaymas.