Déjà vu at Tarnin Austa by Himring

Chapter 1

Maedhros had not chosen Midsummer because it was a festival, thought Glorfindel—not even he would have celebrated the day with a battle. Maedhros had chosen the day for military advantage—to lend them the edge of daylight as long as possible over the forces of Darkness.

They had failed despite that, and, as days grew long, Glorfindel was haunted each year anew by memories of endless hot hours of killing and dying. He might have been, even if the date had been less memorable.

When fire broke over the mountains that dawn, Glorfindel drew a deep breath of recognition.

Chapter End Notes

Tarnin Austa is often interpreted as taking place on the summer solstice, as in the text of the challenge, although the Shire Reckoning Project prefers to read it as taking place at the beginning of Laer according to the Calendar of Imladris (i.e. the equivalent of 1 June). 

I think the wording above would probably just about work either way.

100 words according to MS Word.