How do I get past the overseers in High Oversser Campbell without being seen?

I’m having some real trouble with the first assassination. I’m where I saved the guy from the first overseer. I can’t get past the other 5 on the other side of the gate without confronting them. I tried to kill the one walking into the bunker, but then there was another one.
Any advice on how I can proceed?
Best Answer
By my estimation, you've just saved Overseer Martin, and are here, at this gate:
I like to Blink up to the air duct next to the gate. You have to jump and blink at the same time:
From there, you overlook an open area with three overseers. My preferred strategy is to Blink onto the tops of the street lights:
Blinking onto the next couple of lights gets you close enough to Blink to the stone ledge:
and from there across to the ledge of the building High Overseer Campbell is in:
You now overlook the main courtyard of the Overseer's building. Staying on this ledge will lead you to an open window where you can enter without confronting any enemies.
Ta-Da! You're in! Now to navigate the interior of the building.
Even if you haven't spent runes on upgrading Blink, I think this method will still work. Blink is probably the best skill Corvo has since it allows you to take so many new paths.
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How do I get rid of High Overseer Campbell non lethal?
Thaddeus Campbell can be neutralized non-lethally by burning the Heretic's Brand onto his face. Information on the ritual can be found in the Office archives and in the interrogation room. The Heretic's Brand itself can be found in the interrogation room, as well.How do you ghost High Overseer Campbell?
To unlock this achievement, you need to eliminate High Overseer Campbell. First of all, knock him out and carry him into the interrogation room so you can brand him. In order to get inside though, you'll need a key, so go to a guard nearby and pickpocket them (usually it is in the file cabinet the guard).Dishonored Clean Hands Mission #2 High Overseer Campbell | Ghost | Shadow | Flesh and Steel
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