Were any of your relatives awarded the DCM during WWI. If they were, you can find their Medal Card and the citation for the award on Ancestry.co.uk
e.g. 315253 L/Cpl P Farquharson, 13tn, R Highrs. For fine leadership and good work. During the advance the company became very much scattered owing to the mist and heavy fire….He was instrumental in enabling the company to advance succesfully and reach its objective.