i saw this at the theater in the early 1970 . the most memorable and scary scene be when the german army attack with yellow cross mustard gas for the first time . the german and their horse be cover from head to toe ( or hoof ) with eerie protective suit . the experienced british soldier don gas mask ( only ) and once again await the cloud of gas and the german attacker . the gas cloud move ever closer and finally envelop the british defender . the german move forward slowly menacingly in their scary look garb . suddenly a scream from the defender . this gas be like no other that they have experience before . now you will know why i have remember this scene for the last 30 plus year and still shiver and i think that you will too .