The Lost City - Firing the Second Trebuchet

The trebuchet is jammed, so before you can use it you'll need to fix the problem.

Use your axe to turn the wheel and rotate the platform so the jutting beam points toward the tower to the west. Walk out onto the beam and jump over to the tower.

Grab some supplies from a wooden box. Then shoot a rope arrow into the trebuchet, anchoring it to the rope-wrapped post here.

Jump back over to the trebuchet and try cranking the wheel again. This should free the counterweight so the weapon can work.

Before attempting to destroy the gate, aim the trebuchet at the signal fire (5/5) about halfway between the tower with the rope post and the gate.

Hold RT/Left Mouse to aim at the signal...

...and then release the button to fire.

If you lit the other 4 signals with the first trebuchet, this will complete the Burn Baby Burn Challenge, and you'll receive an XP award. If you missed any of the signals, you can light them later.

Now rotate the trebuchet a little farther to the left to aim at the gate.

Again, hold RT/Left Mouse to crank back the arm and charge the shot.

Then release the button to hurl the fireball.