Army built a 39-27 advantage at halftime and went on a 19-6 run midway through the second to go ahead 77-52.
Tanner Omlid added 14 points with two breakaway dunks and six steals for the Black Knights (5-7) which shot 54.4 percent from the field and 45 percent from 3-point range.
Lafayette led 15-11 in the first half before allowing Army to take the lead for good with nine straight points. The Leopards closed to within 20-19, but Army took a commanding lead after a 12-2 run and never allowed the Leopards to get back within striking distance.
Bryce Scott and Dan Trist scored 13 each to lead Lafayette (4-8) and Zach Rufer added 10 points for the Leopards.
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