The lady who left a will is probably either Annie Haughton of Littleton, Thurles County Tipperary, Maria Power of the same address or an Agnes Coppinger. In the will, Eileen Lydia McOstrich was to inherit Ballydavid, a mansion ( now sadly gone ) and contents- Elieen was nee Hannaford of Cork and married to Brigadier F.I.N McOstrich of County Cork. An officer from The Royal Munster Fusilliers, who was seconded to the Signals in 1922, when irish based regiments were bisbanded. He was stationed originally at Spike Island ( now part of Cobh ). In 1941 he was taken, along with 100,000 other allied troops as a prisoner by the Japanese when Singapore fell. He did time on the River Kwai and was involved in the building of the railroads there ( not the bridge since this is entirely a work of fiction ). He died as o/c British Forces in Lagos, Nigeria ( then called the Gold Coast )
circa 1950. Prior service saw his as c/o Guttersloe with BOAR ( British Army of the Rhine ) in occupied Germany in late 1945. Eileen Lydia survived until about 1960, she remarried before her death to a Vincent Allman-Smith, retired veteran cavalry oifficer, who saw service with the Sherwood Foresters in Dublin during the rising of 1916.
FIN McOstrich was brother to Alec and Dorothy ( Dee )
and son of Francis McOstrich, who was married to Alexander McOstrich 11 and lived in St Luke's Cork City.
There's lots more - but this does answer your query. Indeed all McOstrich's have long histories in military affairs and battles, even going back to the Revolutionary Wars. It's quite true that on a population percentage basis, more irish fought in the Second World war than any other nation.
Hope this helps.