Here's a different 1885 version of "Oh! my Love's in Germany"

Oh, my love's in Germany, Send him hame, send him hame,
Oh, my love's in Germany, Send him hame.
Oh, my love's in Germany,
Lang leagues O' land and sea
Frae Westrey and frae me, Send him hame, send him hame.
Oh, my love's in Germany, Send him hame.

Oh, weary fa' the war, Send him hame, send him hame,
That tysed my love sae rar, Send him hame.
Oh, were he hame again,
How blythe we'd be and rain,
But he's rar ayont the main, Send him hame, send him hame.
Oh, my love's in Germany, Send him hame.

Oh, wad some birdie say, Send him hame, send him hame,
To my sodger far away, Send him hame.
How lonely sighs his May,
Conntin' year and month and day,
For oh! her heart is wae, Send him hame, send him hame.
Oh, my love's in Germany, Send him hame.

from David Balfour's Collection of Orkney Melodies, Edinburgh: Ballantyne-Hanson, 1885.

source: Scottish German History by Wolfgang Schlick http://www.electricscotland.com/history/germany/germany_thomas.htm
In summary: The tradition is this song was originally composed 1630-36 by Colonel Thomas Traill, of HighLand farm, the Laird of Papa Westray. Orkney had a run of bad harvests 1623-36, so many enlisted with the King of Sweden, Gustavus Adolphus, in his recruiting drive for the Protestant side in the Thirty Years War. Countless Scots mercenaries, including eighty-four captains, fought 1630-48 for Sweden allied with East Germany and Austria versus the Catholic Hapsburg nations of Europe.