Difference between BF4 and BF1 armor
Unlike in BF4, where only AT weapons dealt any damage to tanks, in BF1 most weapons deal some (albeit little) damage. Regular frag grenades, incendiary grenades etc. In fact the recent Fall Patch has increased the damage regular grenades deal to tanks.
Another thing is that unlike in BF4 where rear-armor was a tank's weak spot, in BF1 it's the tracks. Tanks can be easily immobilized if attacked from side.
AT weapons
All classes can equip light AT-grenades, which deal much less damage than heavy AT-grenades, but are lighter, and thus easier to throw farther.
Once you level up your assault, you'll gain access to AT mines, as well as the AT "rocket gun".
Snipers have K-bullets, which are specifically designed to damage armor.
Anti-tank rifles spawn as a battle-pickup (for example there is one at E
flag on Sinai Desert Conquest).
Field guns and fortress guns also do high damage to armor and can be operated by any class. Their downside is that they're stationary.
HE mortar can do significant damage to tanks without the need of exposing oneself to direct fire.
AT mines, which can be dropped either by Assault or Artillery Trucks are extremely effective - 3 mines can currently take out any armor in the game.
And of course, tanks are vulnerable to bombs dropped from airplanes. The Attack Plane can be equipped specifically for tank hunting.
Behemoths spawn at most once per map. They are given to the loosing team to "help turn the tide of the battle".
A Behemoth is a special vehicle meant to give an advantage to a losing
team to help them close the ticket gap between them and their enemies.
What exactly triggers them isn't 100% clear, though it's rumored that it's based on time and ticket gap.
Behemoths may appear during Conquest or Operations matches. A Behemoth
will spawn once a certain criteria is met and players will have the
option to spawn into it on death. Should the criteria not be met, the
vehicle may not spawn. In the alpha build, the behemoth appeared
midway into a Conquest match, was automatically destroyed two minutes
before the end of the round, and did not respawn for the remainder of
the round. In the open beta, the behemoth remains to the end of the
round.
Best Answer
You can access it when on deployment map, by clicking on it. You'll then spawn in it directly, on an available seat. There are three kinds of behemoths:
I found some links that can help you out: