Can't Be Done On Peaceful Difficulty.
I Built Walls Around My Town With Stone Gates For Entry, The Ogres Seem To Go For Those If They Are Close.
I Also Put About 8 Archer Units On The Walls And The Ogre Died Before The Wall Came Down, However Your Fort Also Does A Lot Of Damage To Them.
- Ogres Start Showing Up With Viking Invasions.
- Ballista Towers Do A Lot Of Damage To It. Build Them On Towers To Increase Their Range.
- Around Year 100, The Regular Ogres Turn Into Armored Ogres. Which Have Way More Health.
(Normal Difficulty)
Achievement Pops As Soon As One Dies.
Good Luck!