The Germans knew an attack was coming, the only questions were where and when? D-Day On Juno Beach examines the Canadian role in the Allied attack on the most heavily defended place on earth. With obstacles designed to tear the bottoms out of landing crafts, millions of landmines and hundreds of concrete bunkers equipped with machine guns and artillery, the beach was a 400-mile long killing zone. By nightfall, some Canadian units had advanced 10 kilometres into France, deeper than any other division.