The Determined Bride
The Determined Bride was first published on 1st Sep 1996 by Avon in the anthology Married at Midnight [038078615X]. It was available in both hardcover and paperback [same ISBN]. It seems to be still in print!
I do not know who has the e-pub rights to this story, so I don't know if it will ever be available as an e-book.
Set in the Georgian period [but not a Malloren].
Tricked by a clever seducer, Kate Dunstable finds herself a pregnant army camp-follower. She will not let her child be born a nameless bastard, however, and pursues the father into a battlefield, determined on marriage. There she finds that her lover is dead. In despair and in labor, she accepts the offer of one of his fellow officers, a man who expects to die.
But Charles Tennant does not die, and soon they discover that their midnight marriage has created as many problems as it solved.
Where to buy Married at Midnight print anthology:
Note: Married at Midnight is still available "new" in print from Amazon US above.
"Pre-owned" copies of the print editon are available from: Alibris, AbeBooks, Amazon, etc.
I know of no e-books nor audio editions.