Donald McGregor Johnstone

Until yesterday was only a name on the bottom of this old gravestone marker...

Muirkirk, Ayr, Scotland

further research on the Internet came up with this...

Medical Crew on  the HMHS Salta

While returning to pick up wounded at the port of Le Havre, France, Salta struck a mine at 11:43, one mile (1.6 km) north of the entrance to the dam. A huge explosion smashed the hull near the stern in the engine room and hold number three. Water rushed into the disabled ship which listed to starboard and sank in less than 10 minutes. Of the 205 passengers and crew members, nine nurses, 42 member of the Royal Army Medical Corps (RAMC) and 79 crew drowned.

The British patrol boat HMS P-26 attempted to come alongside to assist, but also struck a mine and sank.

Donald was married to Jemima Begg a second cousin 2x removed.  I don't know the story on this one but I do have some source facts. Jemima was the only daughter of  James Begg  and Euphemia Lennox Roxburgh born in 1891. James at the time was married to his first wife Marian Shearer who died in 1893. James then married Euphemia in 1895 when his daughter was 4 years old.  I  wondered if Marian knew about her husbands extra curricular activities.  Census records show he was living with Marian in 1891 and then he was with Euphemia and Jemima in the 1901 Census.