The digitised documentary sources around the 14-18 war offer a particularly favourable ground for observing online heritage uses, given their diversity and the intensity of their activities on the web. The aim of this research project was to gain a better understanding of how these sources circulate, are enriched or even transformed on the web. Through, but also beyond, the unique object of heritage 14-18, this research programme has made it possible to test rigorous web analysis tools and to identify strong points of thought for the enhancement of online heritage. The second phase of this project consisted of mapping the French Great War web, starting from the collection of around 500 sites carried out as part of the legal internet depot; then a quantitative analysis of the Pages Forum 14-18, the central place for online exchanges on the Great War, to describe how the documents are cited and shared among its members. This phase was complemented by 12 in-depth interviews with actors on the Great War web.