OXFORD University made it three home wins in a row when beating the Army 27-21 at Iffley Road.
Tries from Robbie Fraser and Ed David, as well as a Tom Humberstone penalty, saw the Dark Blues lead 13-7 at the break.
Oxford were then awarded two penalty tries in the second half to secure their first win over the Army since February 2013 and lift the Michael Campbell-Lamerton Trophy.
The students are next in action on Friday, hosting the Royal Navy (7.15).
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