Seize wife to get husband

The caption seemed so funny.
Seize wife to get a husband?
As if there were dearth of men
Or she was ugly, unwanted by any one of them
Or she fell in love with some wife’s husband.

Wanting desperately a husband,
She seized the wife of a husband,
Kept her captive somewhere in a dungeon.
And for herself got a husband as her husband!
Got it right with ‘a husband as her husband’?

Never mind if you don't get it right.
Some women are so devious,
They’ll do anything to get a husband.
They’ll even seize a husband’ wife
To get for them a husband.