Of the 32 Irish Jesuit chaplains who served on the battlefields of France, Belgium, Egypt and Mesopotamia, four were killed and two died from illness.
Prayers offered at Masses in the Diocese of Kerry for world peace and for people everywhere who serve in the army of their country.
When the ship began to sink, Fr Byles was offered a lifeboat place several times but he refused, staying to help, hear confessions and pray with those still on board.
