Someone told me since, the three vessel mentioned in the song
have been decommissioned and scrapped decades ago and I 
imagine there probably won't be a Russian invader anymore...

Chorus
     G                          D
The Clíona, the Meabh and the Mucha
     G                  C
The pride of the Irish navy
     G                               D
When the Captain he blows on his whistle
                                   G
All the sailors go home for their tea

     G                         D 
While the army is off in the Kongo
     G                      C 
In Cyprus or some foreign parts
     G                        D
Our navy is strained to the limits
                        G
Deploying its nautical acts
     G                      D
One day from the Russian invader
     G                  C
Defending our very odd fish
     G                          D
We found it was just the red herring
                                  G
From the signals we got from the cis'
 
Chorus
 
Each year they go on manoeuvres
To prepare for defence they are keen
Sometimes it's the Lakes of Killarney
More often the pond in the Green
The canal it could be of assistance
In defending our own holy ground
But due to proposed legislation
We'll have to sail all the way round
 
Chorus
 
We are a seafaring nation
Defence of our land is a right
We'd fight like the devil all morning
Provided we're home by the night
 
Chorus