Union version

Yes we'll rally round the flag, boys, we'll rally once again,
Shouting the battle cry of freedom,
We will rally from the hillside, we'll gather from the plain,
Shouting the battle cry of freedom!
 [bad word] 
The Union forever! Hurrah, boys, hurrah!
Down with the traitor, up with the star;
While we rally round the flag, boys, rally once again,
Shouting the battle cry of freedom!

We are springing to the call of our brothers gone before,
Shouting the battle cry of freedom!
And we'll fill our vacant ranks with a million freemen more,
Shouting the battle cry of freedom!
 [bad word] 
We will [bad word] to our numbers the loyal, [bad word] and brave,
Shouting the battle cry of freedom!
And although they may be poor, not a man shall be a slave,
Shouting the battle cry of freedom!

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 [bad word] (1864 election campaign)

For Lincoln and Johnson, hurrah, boys, hurrah!
Down with the rebellion and on with the war,
While we rally round the cause, boys, we'll rally in our might,
Singing the holy cause of freemen.