The firm responsible for archiving the First World War soldiers' wills that are going online said they reveal some "quite interesting" emotions.
Iron Mountain commercial director John Apthorpe said:
With 230,000 individuals who died in the war, the emotions [that come through] are quite interesting when you read some of the notes they left.
A lot have straightforward statements, but some of them do have personal letters and touches, and a bit more detail about what's happening.
The wills, classed as official records, were only previously accessible through direct requests.
More top news
Theresa May says it "can't be right" for Big Ben to be silenced for four years during renovation work.
A 20-year-old model accused the wife of Zimbabwe's president of attacking her.
The former US president quoted Nelson Mandela in a series of tweets written in response to white supremacist groups in Charlottesville.