 During filming John Wayne (I) (qv) fell from his horse and  fractured three ribs. He couldnt work for almost two weeks. Then he  tore a ligament in his shoulder and couldnt use one arm at all. The  director, Andrew V. McLaglen (qv), could only film him from an  angle for the rest of the picture. His only concern throughout was  not to disappoint his fans, despite being in terrible pain.