This is on an album called "Glory of the Music Hall, Vol. 1," where it is called HERE WE ARE AGAIN.

From the sheet music at National Library of Australia:

Hit of the "Cinderella" pantomime.
HERE WE ARE! HERE WE ARE!! HERE WE ARE AGAIN!!!
(THE BRITISH ARMY'S BATTLE CRY.)
Written and composed by Charles Knight and Kenneth Lyle.
Sung by Mark Sheridan.
Melbourne: Allan & Co., c1914.
"By special arrangement with Francis, Day & Hunter, London and New York"

1. The poets, since the War began, have written lots of things
About our gallant soldier lads, which no one ever sings.
Although their words are very good, the lilt they seem to miss;
For Tommy likes a tricky song, the song that goes like this:

CHORUS: Here we are! here we are!! here we are again!!!
There's Pat and Mac and Tommy and Jack and Joe.
When there's trouble brewing, when there's something doing,
Are we downhearted? No! Let 'em all come!
Here we are! here we are!! here we are again!!!
We're fit and well, and feeling as right as rain.
Never mind the weather. Now then, altogether:
Hullo! Hullo! Here we are again!

2. When Tommy went across the sea to bear the battle's brunt,
Of course he sang this little song while marching to the front,
And when he's walking through Berlin, he'll sing the anthem still.
He'll shove a "Woodbine" on and say, "How are you, Uncle Bill? CHORUS

3. And when the boys have finished up with Hermann and with Max,
And when the enemy's got it where the chicken got the axe,
The girls will all be waiting, 'midst the cheering and the din,
To hear their sweethearts singing, as the ship comes sailing in: CHORUS