Kernan was joined in the dugout for the first time by John Rafferty
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Armagh still had plenty to spare over St Mary's despite having to dip into their reserve strength for Sunday's Gaelic Life McKenna Cup encounter.
Joe Kernan's side were able to fashion a 0-10 to 0-4 win despite being without a host of regulars at Crossmaglen.
The Ulster Champions led 0-5 to 0-2 at the interval with Steven McDonnell among the scorers.
With full-back Ciaran Toner and JP Donnelly impressing for Armagh, they extended their lead in the second half.
Dr McKenna Cup results
Section A
St Mary's 0-4 0-10 Armagh
Fermanagh 0-5 1-10 Monaghan
Section B
Derry 0-12 0-17 Cavan
Queen's University 0-9 2-14 Tyrone
Section C
Donegal 1-6 1-4 UUJ
Down 0-9 0-9 Antrim