I never had a problem with ogres... just check their movement speed (after how many moves do they wait one turn while you move) and hit them in the turn they can't move. Quickling tactics, so to speak.
Sometimes I die of orcish brutes though, encountered them even on the first level of the CoC once. Otherwise I usually die of hobgoblin chieftains, but that was in JADE 0.1.3. I got killed by a hobgoblin leader once as well.
And since there is no penalty yet for fighting with two weapons, I usually prefer to fight with 2 battle axes; barbaric orcish battle axes (-4, 1d7 + 7) can be found starting from lvl 1 of the CoC (though they are rare).
The giant ant worker decides to fight to the death in a blind rage! The giant ant worker attacks the giant ant worker. The giant ant worker is killed! The giant ant worker suddenly seems more powerful! You sense strange vibrations...