Roedd Samuel Thomas Gammon o George Bank, Y Mwmbwls, yn briod â Gladys ac roedd ganddynt dri mab, Tom, Dick a Fred. Gwasanaethodd fel Preifat 29149, A Company, 14th Welsh Regiment, Swansea Battalion. Fe'i lladdwyd ar faes y gad yn 29 oed yn Nghoedwig Mametz ar 10 Gorffennaf 1916. Fe'i coffawyd ag anrhydedd ar Groglen Goffa y Rhyfel Mawr, Eglwys All Saints', Y Mwmbwls, Abertawe..
Yn ystod ei wasanaeth coffa, dewisodd ei wraig y gerdd ganlynol -
Into the field of battle he bravely took his place, And fought and died for England, honour, and his race, He sleeps not in his native land, but 'neath a foreign sky, Far from Wife and Children dear, in a hero's grave he lies, No one knows the silent heartache, only those can tell, Who have lost a Husband and Father dear, without saying farewell.