Ellis was 3 of 7 from the field -- all 3 makes coming from 3-point range -- and knocked down a game-high six free throws.
Army (3-1) took a 31-30 lead into halftime after Kyle Wilson made a layup as time expired in the first half.
The Black Knights opened the second half with eight unanswered points to go ahead 39-30. St. Francis cut the deficit to 45-44 with 10:06 left but Army held the Terriers to just one point over the next six minutes to pull away.
Army outshot St. Francis (1-2) 42.9 percent (24 of 56) to 33.9 percent (20 of 59) and got 35 points off the bench compared to just 10 for the Terriers.
Jalen Cannon led St. Francis with 23 points and 10 rebounds.
With a trio a top recruits from Philadelphia, the Penn State basketball program is primed to finally turn a corner.
Chad Ford provides the latest intel on which players are entering the 2016 NBA draft and which are staying put.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.