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What difficulty level were you playing on?
Marius's hero, stats are around 2231, has a basic slow spell in his spellbook, and not much else.
Army: 78 Imps (upgraded), 11 Gogs, 4 Cyclops.
Single units, of course, all strategically placed.
Without morale, he might have been able to pull it off, but I think 78 Gogs is too many to guard a secondary location in week 1.
It's practically a Gnomish stronghold at level 15.
Although, defeating a Gnomish stronghold is easier).