Good advice for making a walking tank.
But why make a walking tank when you can make a walking nuclear bomb?

Get Bully.
Equip a 2-hander. Preferably a scythe. Every single Man At Arms ability is more efficient when you're using a 2-hander, since damage scales off of weapon.
If you craft a weapon, always craft an axe. Axes > Swords.
Improve your plate armor and craft some boots for that delicious nutritious movement speed boost. Be sure to put nails on your adidas - nobody wants to be slip sliding around in the middle of a battle.
Add rubies to your equipment and you will become immune to everything but physical damage.
Add metal scraps to your armor and you will become immune to physical damage.
Get Bully.

Get a mage to back you up. Mages make great sidekicks. Put Leadership on the mage - they don't need bonus to attack or crit or anything anyway.

What to do when someone it's go time:
1. Nullify Resistance
2. Battering Ram
3. Whirlwind
The battle should be over, but in case it isn't here's what to do next.
4. Mage casts Mass Slow
5. Mage casts Oath of Desecration on Warrior
6. Mage casts Wildfire on Warrior
7. Warrior eliminates every remaining enemy with extreme prejudice.