Smith will join as a redshirt junior with two years of eligibility remaining.
Battle's commit comes just one day after the Terps landed offensive tackle Santana Saunders.
The university is searching for a new head team physician, who will report to the University Health Center.
He joined Mike Locksley's staff as special teams coordinator and inside linebackers coach.
Tanyi will attend minicamps with the Baltimore Ravens and Los Angeles Chargers.
Jacobs finished in the top-25 in Maryland history for receptions and receiving yards.
After two years as the starting center, Moore saw time across the offensive line in 2018.
Aniebonam racked up 39 tackles in 2018 and returned a blocked punt for a touchdown.
Watson led the Big Ten in tackles per game and interceptions in 2018.