Letter home to Bradford from Russia 1917

Grandage Gordon M
Although the letter was sent 24th February 1917, it didn't arrive at its destination until 2 months later, 18th April,1917. My grandfather, Gordon was officially known as: Petty Officer Gordon M Grandage 9730 HM Armoured Cars RNAS No 1 Squadron, C Section His squadron returned home on or around July 1917 after the Russian retreat from Galicia.