Actually, I was holding out on you, George. I REALLY didn't know that. I did a copernic search, which I find to be the deepest search when you are looking up things which are likely to have very few leads. There were 57 references for The Soldier's Adieu, one of which looked promising (most had Civil War or Mexican War origins) and PRESTO, there it was. Scotstext.org (It's filed under Fragments of Tannahill)

More about Copernic, since we are talking about searches: Copernic requires a download, but is by far the best search engine I have found. It has both a free and a pay version. The free one is good enough for me. It allows you to keep many searches in memory that you can update as you wish. It even tells you when you last searched. If you search for a certain thing today, and say two weeks from now you want to see if anything new has been added, it will search again. Then if you are confident that the old material was of no help, or you have investigated it thoroughly, you can tell it to browse specific types of results, namely the new ones that it finds. It also can be set for phrase, all words, etc. I normally choose all the engines, but every now and then, one of them develops a bug which returns dozens, even hundreds of false leads. Then I eliminate the faulty engine and try again. They are quite good about updating and eliminating these errors. There, I've given away one of the secrets to my store of knowledge.