10th October 1918 RMS Leinster was torpedoed and sunk by UB-123, killing 564 on the Irish Sea.
RMS Leinster, article from Wikipedia     https://en.wikipedia.org/wiki/RMS_Leinster

BALLAD OF THE RMS LEINSTER   - The Magee Brothers       https://www.youtube.com/watch?v=I01o5DPusP0
ANTHEM OF THE MAILBOAT LEINSTER   - William Byrne      https://www.youtube.com/watch?v=u7182MkaCSY
RMS LEINSTER   - Winter Heavy Snow       https://www.youtube.com/watch?v=tg1F_SfUAls