More than 400 postcards have been sent to the last known addresses of those who died in the First World War.
Current householders in Grangetown, Cardiff, have been asked to place them in their windows as a sign of remembrance for the 100th anniversary of the Armistice.
Grangetown Local History Society researched the details of most of the 330 men on the war memorial in Grange Gardens, as well as another 153 men and women who were omitted when it was built in 1921.
Each postcard includes the name, regiment or ship and date of death of the casualty.
"It's such a great idea", said local resident Ailsa Jenkins. "The last four years have been about celebrating the First World War, but I think sometimes if you're not connected to it, it's faceless and nameless. So when the card came through the door, I thought it was fantastic. Such a great way to celebrate all those who died for the rest of us."
Some streets and homes no longer exist, so the nearest chapel, church or school has been asked to display the cards.
"Time passes, people move out of the area and new people move into the area", said Michelle Darby Charles from the Grangetown Local History Society. "We need to remember those who have died because of the sacrifice, so for every postcard there is a person behind that postcard. A family, a mum, a dad, a brother, a sister".