Final answer:
Operation Tiger, a D-Day rehearsal at Slapton Sands, ended in tragedy when German E-boats attacked, emphasizing the need for security and communication in the Normandy landings.
Step-by-step explanation:
The historical event that took place at Slapton Sands was part of the preparations for D-Day during World War II. In 1944, the area was used by Allied forces to conduct Operation Tiger, which was a full-scale rehearsal for the Normandy landings. Slapton Sands was chosen because its beach resembled Utah Beach, one of the planned landing sites in Normandy. Unfortunately, the exercise ended in tragedy when German E-boats intercepted the convoy of Allied ships, leading to heavy casualties. This event had significant implications for the actual D-Day invasions, as it underlined the importance of tight security measures and effective communication.