Sandisondaughter
Air Britain's book 'The Squadrons of the Royal Air Force' contains some details of 15 Sqn
No.15 Squadron was formed at Farnborough on 1 March 1915, from a nucleus supplied by No. 1 Reserve squadron and after training moved to France in December with B.E.2c's as a reconnaissance unit. Artillery spotting and photography occupied the squadron for the rest of the war, the obsolete B.E.2c's being replaced by R.E.8s in June 1917. During the German offensive of March 1918, No. 15 was pressed into ground-attack missions against the advancing enemy troops but resumed its corps reconnaissance role after the crisis had passed. In February 1919, the squadron returned to the UK and disbanded on 31 December 1919.
Their bases as below.
Hope this helps.
WT