Obscure Novel

[CSAJew]

Lost title/author -my wife loved this novel she read circa 1983-84 - would like to surprise her with it. The storyline: alternate timeline with steampunk-style British Empire (supported by Irish magic) facing off against threat of Martian invasion ( a la HG Wells). The protagonist is a young kilt-wearing British naval officer in command of what his Irish witch fiance refers to as 'the sinkin' boat' (experimental submarine). It was a new paperback bought at the mall bookstore.
I seem to recall a nautical theme cover. It only appeared briefly and disappeared immediately after she bought it. It's been 30 years since it (ahem) sank without a trace. Any ideas?

 

[ImaginaryEvents]

Possibly "The Second War of the Worlds" (1980) by George H. Smith

Magic, steam, submarines, naval encounter on cover.

>The Second War of the Worlds is a sequel to Kar Kaballa in which Wells' Martian invaders (from War of the Worlds) have taken a step sideways to Thor (the Anwwn-equivalent of Mars) to attempt the invasion of Anwwn. There are primitive submarines, dirigibles, and Old Souls involved, and the Martians are once again defeated. Two men from Earth, Mr. H and Dr. W, assist MacBride defeat the Martians; the story makes it clear that these characters are obviously Sherlock Holmes and Dr. John Watson.

 

[CSAJew]

By Jove, I believe you got it!

Hurrah! "Imaginary Events" has successfully completed The Quest for the Obscure Novel! My wife will be quite pleased when I surprise her with it. Grayshus, Seenyor! (Southern-fried Spanish)