Thank you! Basically, you got several options to deal with the wood wall.
SPOILERS
If you reach it early, one woodcutter might be enough. With 2 it's well doable. You can also get a magus to remove some wood tiles, or delay the crumbling so that you have enough time. There is also a pass through the mountains, so you can circumvent the wall if you have the food for the treck. And finally, you could even bridge around the forest wall on the southwest sea.