Engineer and his buildings, especially Sentry guns, can be a huge problem for the opposite team. So there are some classes that can counter those problems.

Counter classes are usually the ones, who can destroy your Sentry without risking their own lives. You must realize though that the Sentry gun has "only" 216 HP when it's on level 3. It can't survive 3 well aimed rockets on it's own so it will need your help.
When the enemy would decide to make a push, it's time for you to recognize if your gun will make it or won't.

Don't be afraid to abandon your nest when it will go down. If you'll survive the push and your buildings aren't, try to setup another nest slightly back behind your team.
Your life is precious, dying when saving your buildings simply isn't worth it.

BUT if you'll manage to escape and you have Rescue Ranger equipped, you can take one of your buildings with you from far away.

Spies were here since beginning of time and they are considered as a main Engineer counter. But over the years best counter has became Demoman.
Spy and his Electro Sapper can disable and harm your Sentry until you'll smash it with your Wrench two times (three with Jag). Good Engineers can deal with Spies and their sappers but when you think about it, Electro Sapper isn't designed to be the primary building removal.

Let me explain, a good Spy won't run at Engineer nest expecting to sap everything and win the game. No, good Spy will wait until his team manages to make a push.
See? If you have Sentry disabled and an enemy Heavy is trying to rush, you feel pretty helpless beacuse you can't heal your gun when the Sapper is on it + your gun is also disabled. In this situation just run away.

But in most of 1v1 Spy vs. Engie fights, you are in advantage with better firepower from your shotgun. Just don't turn your back towards him and you should be fine. Also keep in mind when the Spy would sap your buildings, just kill the Spy first and then remove the sapper (you can do both at the same time allowing your Sentry to finish the Spy).

Solve practical problems

Sticky spam and grenade spam should teach you to not deal with theese guys face to face. Same goes for the Sentry. If you see a Demo firing his shots on your Sentry, use Rescue Ranger to heal it and Wrangler to absorb the damage. Do not even think about repairing your gun with your Wrench or else you'll get exploded.

If you see a Demo firing stickies underneath your Sentry expecting to "one-blow" it, use Rescue Ranger's teleportation and get your gun from there immediately. You can also help yourself by firing the new Short Cicruit.

If your Sentry gun stuns upon a well-prepared competent Heavy, you can barely tank the damage. If the Medic is behind this back, be very wary and you'd be better off using your Wrangler.
I advice you to give up your Sentry gun if the Heavy is the core of the enemy push, if he's surrounded by his teammates, you basically have no chance to save your buildings.
However, the duel between the Heavy and your Sentry is often affected by location and spot.

Soldier alone should never win a direct fight against your Sentry. Watch out for the long distances and corners as they can peak and blast your Sentry gun away. Rocket jumping Soldiers aren't the trouble for you to thought about.

If the Soldier has activated his Battalion's Backup, keep in mind that your Sentry now does 50% less damage to all who are under the buff.

Sentry is the direct counter to Scouts. When the Scouts drinks his Bonk! Atomic Punch. He can be a credit to the enemy push.


After Jungle Inferno, Pyro could melt level three Sentry in a few seconds...
I'm glad those times are gone now but Pyro isn't that useless against Sentry though. If the Sentry's facing other wall or peaking other player, Pyro can strike it down pretty easily.


An Engineer won't be a problem against your nest.


Without his Uber pushes, Medic is pretty much useless against Sentries.


From far away he can damage and even destroy the Sentry if he finds a good sight line.

This is your biggest enemy. When your opponent's medic is running stock, you better watch out! Almost every Übered class can destroy your nest. Your team can assisst you while you're under attack. Pyro can airblast, Demo with Loose Cannon can dong them out of the planet etc. etc.

Use Wrench and RR to give your gun chance to survive. But if you see that the Übered class is Demo, Heavy or Soldier, you better just abandon your nest.

However when you're playing against dumb medic with Quick-Fix, Vaccinator or even Kritzkrieg against Sentry. You should just make clear that they'll die quickly.

Be aware when the enemy Medic would pop the Übercharge. Your counters will be nearby when this will happen so keep and eye on them! Be ready for anything.

Remember, everyone wants your gun down!

Thank you so much for reading and I hope you learnt something new here. Don't forget to rate this guide and write a comment, I read all of them and they really cheer me up.

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