i have always sang this song with the introductory line being
'twas on good friday all on an april day' as easter is more likely to be in april than may?

i also sing an extra verse as the second
'a motor car was dashing through the early morning gloom
a sudden crash and in the sea they went to meet their doom
two irish men lay dying there just like their hopes so grand
they could not give the signal now from the lonely banna strand.'

in addition to this my fifth verse is
' they sailed for queenstown harbour said the germans were undone
the british have us vanquised man for man gun for gun
weve twenty thousand rifles here that never will reach the land we'll sink them all and bid farewell to the lonely banna strand.