Since this site isn't finished yet, here is the first tip from [YT]PetriP-TNT:
"
Fast way to plant the dynamite to Gun Controls at Battery:
Usually, when you play Battery as Allied, you first take the forward bunker, and after that start attacking to the Gun Controls or try to go in from the back door. I consider this a better tactic:
When you start Battery as allied engineer, run straight to build the assault ramp. Then run up the assault ramp, and run to the door that leads to the Gun Control/Axis second spawn. Secure your back, and run to plant the dynamite. Also, there are some alternative tactics:
A: If the server doesn't have friendly fire on, you can ask someone to Support fire-,grenade or
panzerboost yourself to the upper area.
B: After you have climbed up the assault ramp, you can try to trickjump to the window with the MG42. It is very, VERY hard, if you haven't done it before, but it isn't impossible. This way there is less chance of someone noticing you, and it is faster, too. I have done this many times, even against players, who can be considered as pros."
There I only can agree to [YT]PetriP-TNT. If you manage to run to the Gun controls instead of focusing on the forward bunker, the Axis surprise especially on Pubs is great. Nearly every time someone sneaks in from the front they think you came from the back. Funny :)
Mining the Entrance to the main bunker
Every tip has its counter-tip! :-) Thanks to Patator_Warrior for this one:
"For example, on Battery, you can place one or two mines in front of the
door that leads to the gun room. It has two advantages: first, you
ensure that nobody can sneak in by this door (in fact, the tip must be
done very quickly without watching at the mines). Second, it delays the
possible entering of Allies if you loose the forward bunker at the bad
moment (full time before spawn! :-( ). The drawback is that you must
watch out if you want to take the spawn again. But, a very useful
tactic is to go through the MG42 nest to the forward bunker when the
allies are in the first room. First, destroy the ramp if you are a
covert and go to the flag... If you can defend the flag, your teammates
must kill the Allies in the room, allowing you to prevent the Allies
from rebuilding the ramp."