[...] there were cars and boats here to carry the calves too small to tread water. [...] in town there were people - hundreds of them - snapping enough pictures and video on smartphones to stir up a viral sensation. Before dozens of cowboys drove the herd through town Sunday afternoon, some 500 head of cattle sat stranded for days on a 50-acre piece of land that had become a slowly shrinking island as the flooded Trinity River swallowed it up.