Answer: Gilgamesh climbed to the mountaintop.
The Epic of Gilgamesh is a poem from Ancient Mesopotamia, which tells the story of Gilgamesh, king of Uruk. It is considered the world's oldest work of literature.
In this excerpt, there are a couple clues that demonstrate that the story is about a hero. The first one is the fact that the travellers had completed a six weeks journey in only three days and nights. The second one is the fact that Gilgamesh climbed to the mountaintop. Both feats require exceptional strength and endurance, which heroes often display.