Control of bridges for engie's Unstoppaple

Put 3 engies making a arrow shaped line of sentry's in the middle of bridge and you got a good defense.

Something that can stop that (I'm assuming you're talking about 2fort) is a couple of demos firing their stickies at you from the water. That's what I do to help break that.

Hm... ive never seen that done before. Ill try it sometime. But it leaves the sewers open ><

Demos or solders rip that sort of defence apart.  The closer you are together, the easier it is.

Yeah, a single demo from the water, a single demo from top of battlements or a demo or maybe pyor uber and its over.

all the enemy need to do is take out the front one with stickies, then a good soldier will just stand at the two entrances and take the rest out. the SG can't reach that far unless you put them past the bridge halfway point.

something i would like to try is have a claocked spy without disguise to run across the bridge and hopefully was able to get in the entrence of the enemy's entrence, then uncloack and see if the engie's sentry will hit the engies, that would be hilarious.

I think 2fort is a lot of fun when you have a group of engies walking their sentry guns across the bridge and up to the enemy's main entrance.  But I don't know that's it's that effective as if you lose your whole setup then you've just wasted a ton of time and resources and not accomplished anything. 

when someone starts to build a sentry next to my sentry i quit the game

Actually, when my team is on the offense and the enemy is holding us off inside the courtyard I often see an Engie building a sentry outside their base in one of the corners. It helps stop the enemy from attacking us from behind by dropping off the battlements.