rose brennan, daughter of edward brennan. became a nursing nun in the first world war, received gallantry medal for work in belgium
Do you know where Rose was born and lived before she became a nun? It is likely that a Gallantry Award would have been recorded by the local newspaper at the time. Do you know the title of the award because the awarding country will probably have an official record.
If you think that Rose belonged to a convent in England or Wales, then the Catholic Family History Society has an Index of Nuns - its web-site is at http://www.catholic-history.org.uk/cfhs/
Hope this helps
Jim Lancaster (Bury, Lancs., England)