Hyrule Warriors/Eldin Caves

With Zelda disappearance, morale feels quite low but now is not the time to search for the princess. Instead Impa and Link has to find the source of where all those monsters come from. It's recommended you start with Impa as her massive sword can cut enemies down with ease.

Central Fort secured
Even though you can take down enemy checkpoints, your first goal is to unblock the boulders with bombs near the center where the nearest fort is. Remember to attack until the base boss appears. Attack the owner to confirm that you own this base. Then keep going to the top left to meet the general and Link as the middle north left is closed for the time being.

Protect the bombchus!
With the path blocked, you have to go back and protect the bombchus in the south, marked by a circle and cross. Slow the enemies down by attacking generals, enemy checkpoints and bases that goes along the path the bombchu is going. Not to mention how big the bombchu looks like! Even if you fail, the Gorons will prepare more in this circumstances.

Sheik makes her appearance
There's a cutscene showing Impa, Link and the soldiers surrounded by monsters as Sheik with her harp shows up and astonishingly attack all the monsters. "Ocarina of Time" veterans would know who she is but it's best not to spoil at this time. Impa although skeptical, agrees to help her in the battle.

Conquering bases
Anyway, go around the map on the west and the south, attacking and clearing enemy areas. Apparently, Impa, Link and Sheik decides to exit this level by going down to the base on the south-west. So go there to end this battle. Impa hears the news from a soldier that someone in "Faron Woods" is in a battle. So this marks the end of this level.