I think it was in it, but the copyright is 1918! OWALW was made up from "bits left over" to a large extent.

Here's that missing verse:

4. Little Private Patrick Shaw
He was a prisoner of war
Till a Hun with a gun
Called him "pig-dog" for fun.
Then Paddy punched him on the jaw.
Right across the barb-wire fence
The German dropped, then, dear, oh, dear!
All the wire gave way,
And Paddy yelled "Hooray!"
As he ran for the Dutch frontier. CHORUS