[Ilander]

Well, here's the thing...the main nemesis of the engineer is the spy. Granted, 2 uber heavies will kill the following strategies, but really, what won't two uber heavies kill???

So, build your tier 3 sentry. You can't do this with less than a tier 3.

Now, hopefully you built near an ammo point, because you aren't going to have the chance to build a dispenser for a while! The idea here is to protect your gun at all costs...remember that, at short range, they will rotate 360 degrees...well, that means that as long as your sentry lives, you live.

Constantly repair your sentry. Even if a spy is sapping it. Keep your metal up (you built near a ammo point, right?), keep smacking it with your wrench. It's that simple.

If a spy tries to sap it, you knock off said sapper. If they try to stab you, 2/3 of the time, the sentry gets them (360 degree rotation at close range!). If they do kill you, the spy gets killed by the sentry.

The best placement is in a limited visibility junction. Pick a point where the enemy has a few different ways to come in, and make sure to cover all of them with your gun placement.

Dustbowl is my map of choice for that achievement.

I used the above strategy, and eventually was able to build a dispenser right behind me, which constantly healed me and gave me ammo/metal. It died constantly, but I never let spies kill my gun.

Oh, and shouldn't we start "What are you playing right at this very minute Thread 2?"