Except that your Ogre Bludgeoneer (which is the stat for an Ogre Minion) has a 28 AC, which your townsfolk straight up cannot hit. You'd need 20:1 against each ogre minion to kill one, and there should be 4 or 5 minions for each normal monster you're switching out for the encounter. Meanwhile, we've pulled 2 out of the 5 for a standard encounter as minions, meaning there's 8-10 minions, each automatically killing one townsperson on a roll of a 2 or higher. So, your 20 townsfolk might kill 1 ogre minion (which is actually fairly reasonable) before all being killed.
It's almost like 4e D&D was designed by people who understood game design....

But, hey, like I said, this is just bog standard edition warring stuff that's been hashed out for over a decade. Why bother letting things like facts interrupt now?