On the grounds of an estate in the English countryside, 15 middle-aged Jewish men from the United States, Canada, Britain and Israel made a pilgrimage Tuesday to pay honor to the woman who rescued them from Germany on the eve of World War II. They had come thousands of miles to thank Dorothy de Rothschild, their benefactor. ”Without her all of us here would have been just a statistic of the Nazi death camps,” said Henry Black of Britain, one of the participants.