Releasing gas was a hazardous and terrible occupation. They could only release it when the wind was in the right direction and as we know wind can change direction in a moment. Gas could be blown back onto their own lines.
Information from his papers
Thomas Scambler
Regimantal Number 192816 (though I think there is a second record with 192814)
Royal Engineers - Unit "Q" Special Coy RE
6/8/15 - 17/2/16 Driver
17/7/16 - 18/2/17 Pioneer
18/2/17 - 7/18 L Cpl
7/8 - 6/2/19 IICpl
Former occupation - Farmer
Section 4 overleaf Military Medal ? Bar or MM & Bar. Not sure which.
Second document
Enclosed Bar to MM ref London Gazette 11/2/19
His address at 11/9/19 Oundle House, Rickwell, Nr Oakham
My thanks