Hi Adam
Henry's army records are available to view on Findmypast, in Military just enter Henry Prosser Evans, army number 3578 and it should give you the records.
Also you will find several trees on Ancestry which have quite a lot of details about him and his family.
If you don't have a sub for them, reply to this post and then we will be able to swap email addresses by personal message.
Look forward to hearing from you
Sheila
