The Ents:
* Merry and Pippin encounter the Ents: While fleeing from Orcs, Merry and Pippin stumble upon the Ents, ancient tree-like creatures who inhabit Fangorn.
* The Ents' Meeting: Merry and Pippin learn about the Ents' history, their relationship with the trees, and their deep connection to the forest. They also hear of the Ents' concern about Saruman's destruction of the forest.
* The Ents' Decision to March on Isengard: The Ents, enraged by Saruman's actions, finally decide to go to war and march on Isengard. Merry and Pippin are caught in the midst of this decision, and their influence on the Ents is critical.
The Battle of Helm's Deep:
* The Ents' Arrival at Helm's Deep: While the forces of Saruman are besieging the fortress, the Ents arrive with their massive strength and break through the siege, turning the tide of the battle.
* Destruction of Isengard: The Ents attack Isengard, destroying Saruman's fortress and effectively ending his power.
Other Events:
* The Ents' Care for Fangorn: The Ents, after their defeat of Saruman, return to Fangorn and begin the long process of restoring the forest.
* The Entwives' Mystery: The Ents mention their wives, the Entwives, who have vanished long ago. Their fate remains a mystery throughout the story.
Significance of Fangorn Forest:
* Importance of Nature and its Defenses: Fangorn Forest is presented as a powerful and ancient force, representing the strength of nature and its ability to resist outside forces.
* The Importance of Environmentalism: The Ents' struggle against Saruman is a powerful allegory for the fight against environmental destruction and the importance of protecting nature.
* The Ents as Guardians: The Ents are presented as guardians of the forest, a force of ancient wisdom and power that defends its domain.
Fangorn Forest is a significant location in _The Lord of the Rings_ and plays a crucial role in the events of the story.