I just discovered what may be the first published version of this song in the Western Australian newspaper the Mirror 24 November 1923

The Fenians' Rescue

A noble fine ship and commander,
Called the Catalpa, they say,
Bore down on the shores of West Australia,
And took six bold Fenians away.

Chorus.
Then come all ye "screws," warders and gaolers,
Remember Perth Regatta day.
Take care of the rest of your Fenians,
Or the Yankees will take them away.

The Perth boats were racing for prizes,
And sporting about all the day,
When the Yankee came close up behind them,
And took six bold Fenians away.

Chorus.

The "Georgette" gave chase with brave warriors,
With orders this Yank to arrest.
When he hoisted his star-spangled banner,
Saying "You'd better not touch us, I guess."

Chorus.

For seven long years they had served
And seven more they had to stay.
For defending their country, Old Ireland.
And for this they were banished away.

Chorus.

Now they are in the States of America
And they have said to the prison, "Goodbye,"
And they'll wear the green flag and shamrock,
And shout for Old Ireland "we're ready to die."

I have added it to the Australian Folk Songs collection (now in its 20th year online)

see http://folkstream.com/180.html

cheers

Mark