The position selected by Taylor was admirably suited to this emergency. Scott, though a Whig, wrote out a long explanation, showing that on the Rio Grande the army had a more healthful camp than before, better drinking water, more abundant fuel, better grazing and a better port. Information could be obtained more quickly; the border watched more closely; an invading force pursued more promptly; and its line of retreat cut more certainly. Besides, the river amounted to a great breastwork, for this part of it could be crossed with safety at only certain points, and a body of men, even though comparatively small, could not cross anywhere on its lower course without peril. It was not, however, simply that the Rio Grande position seemed far the best. The nature of the region made it essential. Taylor had to be in that vicinity or else near Corpus Christi, and for purposes of defence the latter point could not be deemed satisfactory. Now the necessity of defence was entirely due to the threatening conduct of Mexico. Therefore she could not reasonably complain of our precautions; and if she could not complain, then no one could do so in her name.[7.33] But the challenge was triumphantly thrown out: Can it be denied that our taking a position on the river did in fact cause the war? In view of the data it can and should be denied. First, joint occupation of the disputed region might have gone on peaceably, as occupation of that character has continued elsewhere, but for a distinctly aggressive step on the part of Mexico; and, secondly, for her the Rio Grande had no particular significance. She claimed all of Texas, and intended to drive us from it, if she could. Furthermore, the crass vanity and ambition of Mexican generals and the exigencies of domestic politics would probably have led to an attack upon us, had Taylor remained at Corpus Christi, or even pitched his camp at San Antonio. In spite of express orders, Mejía actually attempted an offensive in the intermediate region. When the Mexican government gave formal notice to England and France in the summer of 1845 that war had become inevitable, our army lay far from the Rio Grande. Taylor's advance to the Bold River no more produced the war than Pitcairn's march to Lexington produced the American revolution. It was an effect and an occasion, but not a cause.[7.34] [MEXICO THE AGGRESSOR]