A Messy Courtship And Subsequent Divorce

From The Yelverton marriage case, Thelwall v. Yelverton...:

However it appears that after ten days or a fortnight he [Captain Yelverton] became a constant visitor at the hut of General Straubenzee. The inmates were Mrs. Straubenzee and Maria Theresa Longworth. Maria Theresa Longworth says: "He visited as my accepted lover. Madame Straubenzee was perfectly aware of all this, and she made opportunities for our being alone, which she would not have done if she did not know the relation in which we stood."

She says he was her honourable accepted lover but still that his circumstances were such that marriage could not then take place. That when he told her about his circumstances she said, "There, in God's name, let us part--visit me no more;" but that, to her great surprise, he visited her the same evening.

A book of letters between Yelverton and Maria Theresa:  Correspondence between the Honourable William Charles Yelverton ... and ..., by William Charles YELVERTON (Viscount Avonmore.), Maria Theresa LONGWORTH (calling herself Maria Theresa Yelverton, Viscountess Avonmore.)

Also see Crimean War Letters:

"Mrs. Straubenzee is differently situated from you my love. In the first place she has no children; next, her husband is a General Officer, and can command much more accommodation and comfort than I can. 

Crimean War Letters

The Crimean War per Wikipedia.

An Officer's Letters to His Wife During the Crimean War, By Richard Denis Kelly (1815-1897):

"The Queen has sent two silk handkerchiefs, hemmed by herself, to be given to two wounded men in each regiment. We got ours today, one black and the other coloured, and very neatly worked; they are to be given to Sergeant Smith of the Grenadiers who was wounded in eight places and to Private Boyce...". 

5 November 1855:

"Mrs. Straubenzee is differently situated from you my love. In the first place she has no children; next, her husband is a General Officer, and can command much more accommodation and comfort than I can. He has both a marquee and a hut at his disposal has stables and coach-houses built for him, and is surrounding his premises with a wall to make him more private.

 This I can't do, as we haven't the space in our camp. But with all this, Mrs. S. is exposed to a great many discomforts to which a lady must find it hard to submit. I know my dear Ellie, that you can rough it with anyone, and that you would willingly submit to any hardship to prove your love to me; but, believe me, it is best for both of us that you should remain where you are at present.

 I can well imagine what you went through in that agonizing time in April; it showed the deepness of your attachment to me and God grant you may never be exposed to such a fearful trial again.

I hope I shall get the books by the mail due today, but not in yet. I have just read "Sunny Memories," by Mrs.Beecher Stowe, and liked it very much. I have never heard of the other."