no problem Denise
it's an honour to try and trace a brave mans actions
SDGW was originally a set of books Soldiers Died (in the) Great War, published after WW1, it lists the 'main' information that was known about the soldier. it's now in CD format and is a fantastic tool for any researcher
the attestation (or enlistment) papers were part of what the soldier signed when he enlisted, Canada is lucky i understand you can access them on line. in the UK we have haven't got that far and there's another blow in that 60% of them were destroyed in the blitz in WW2
Yes it would seem he was a tunnel man before the KOSB, i assume that was where he first joined, was he a miner? or worked in the construction industry?
i think he would have been injured or wounded while in the RE and when he recovered he was sent to the KOSB
have a look at this page of the tunnelling companies
http://www.1914-1918.net/tunnelcoyre.htmand i could suggest the (fictional ) book 'Birdsong' sebastien faulkes (check spelling) for a taste of what it was like
