Niles, John Jacob. Singing Soldiers. New York: C. Scribner's Sons, 1927, page 114f:

WE WISH THE SAME TO YOU

To-day is Monday—
To-day is Monday—
Monday the bullets—
Oh, you dirty Germans,
We wish the same to you.

To-day is Tuesday—
To-day is Tuesday—
Monday the bullets—
Tuesday the bayonets—
Oh, you dirty Germans—
We wish the same to you.

[similarly:]
Wednesday the shrapnel—
Thursday the mustard gas—
Friday the dressing station—
Saturday the hospital—

[The remainder of the song cannot be viewed with Google Book Search.

[The book also gives the tune.]