Bathsheba was the wife of which soldier in David's army?

Answer: Uriah the Hittite

She was Bathsheba, daughter of Eliam and wife of Uriah the Hittite, who was away with Joab's army.

“So David sent and inquired about the woman, and he was told, “This is Bathsheba, the daughter of Eliam and the wife of Uriah the Hittite.” At this, David sent orders to Joab: “Send me Uriah the Hittite.” So Joab sent him to David. When Uriah came to him, David asked how Joab and the troops were doing and how the war was going.”— 2 Samuel 11:3, 11:6-7 (BSB)