In May 1940, the sky above the Netherlands turned black with German planes. Within hours, bombs rained down on Rotterdam, bridges were seized, and paratroopers landed deep behind Dutch lines. Despite fierce resistance in places like the Grebbeberg, the Netherlands was outmatched. On May 15, after five brutal days, the Dutch army surrendered — Rotterdam lay in ruins, and the swastika flew over the Low Countries. A small nation was conquered, but its spirit would fuel years of underground resistan