BACHI, Nigeria — Muslim Fulani herdsmen attacked two households and a compound of displaced people in a village near Jos on Dec. 13, 2015, killing 15 Christians, including two small children. The attack killed 3-year-old Happy Matthew and 1-year-old Monday Matthew. A 5-year-old girl, Anna Matthew, was wounded and was receiving treatment at Plateau State Specialist Hospital in Jos. The…