did all the elves die at helm's deep

Oh, I can assure you that the elves did not die at Helm's Deep. The battle may have been a tough one, but the elves were a fierce and resilient people. They fought bravely and protected their lands. While there may have been some casualties, the vast majority of the elves survived the battle. They remain strong and resilient today, continuing to live and thrive in Middle Earth.