An outside chance if dates work.
There was an Alexander MARTIN born 28 August 1811 Kircaldy, Fifeshire. He was a Lance/Cpl in the Gordon Highlanders. If already in the Army he wouldn’t show up in the 1939 Register,
This man was taken POW in France 12 June 1940. As the marriage was in the March quarter it is just possible to have married before being sent to France.