relation's at war

My Mum's Grandad went to war and got wounded on the Gollipoli peninsula he got sent to the London hospital. He didn't go back out to fight but he come back home. when he came back he had with him five serve's metals and a german mug and also a note to his wife.His name was Frank Keast.And the my Grandad's Dad went to war to but I don't no much about him