Commandos: Behind Enemy Lines Mission 14 - D-Day Kick Off

It's the end of May, 1944. Everything is ready for Operation Overlord. General Eisenhower is only waiting for the weather conditions to be the best. At both sides of the English Channel, tension mounts.
The last air photographs show four powerful cannons placed near La Rivière, in the area code named Juno. These could be a serious threat to the landings.
Your mission: to take them out. This is the way you will write the opening page of the greatest landing of History.