Letters and postcards between Annie O'Connor and friends, brothers and future husband

My grandmother Annie O'Connor (married name Ashe), received a number of letters between 1915-1919 from friends, brothers and her future husband. 2 letters from a William Elbourne came from the trenches in 1915 and 1916. The one from 1915 mentions about people in a war hospital and that he had not heard from his family in a long time. He also mention that his family had been mistakenly sent papers saying that he had been killed and that he had to correct this. He also reports of a zeppelin dropping iron in his yard. He may have lived in England. Annie was from Dublin but her family may have been from England. Another item is a postcard from 1919 from a W.E., which may have been from William Elbourne too and suggests he survived the war. Thomas Ashe was a Dragoon Guard and married Annie. There aren't many letters from him to Annie. His number may have been No. 8356 perhaps as a signallers. I'm not sure of the regiment. Annie received a mix of postcards from different senders. Some talked about the weather and one asks about bringing girls over from Blighty. One postcard is in shorthand. Some are addressed to Ada, Annie's sister. The postcard from Calais is likely from William.