Why J.R.R. Tolkien wanted trees that could actually march to war

Ideas & Philosophy · Published 19 October 2026 Swipe more like this →

In short: In Shakespeare's Macbeth, the forest of Birnam Wood moves toward the castle. Tolkien found this 'shabby' and wanted something more visceral. His solution was the Ents: sentient, tree-like giants who could physically tear down walls like bread-crust, turning a poetic metaphor into a literal, walking army.

Tolkien's creation of Ents was rooted in a specific literary frustration. He felt Shakespeare's use of the moving forest was a weak device and sought a setting where trees would 'actually go to war.' This led to the creation of the Ents—massive, humanoid creatures that closely resemble the trees they shepherd. While they possess extraordinarily tough skin capable of eroding stone, they remain vulnerable to fire and axes. They are characterized by extreme patience, with a sense of time so dilated that they consider a three-day deliberation to be 'hasty.'

The mythology of the Ents is deeply tied to Tolkien's personal life and environmental ethics. Scholars suggest the Ents may represent a wish-fulfillment response to the destruction of the English countryside during his lifetime. They serve as 'Shepherds of the Trees,' a role established in the lore to protect the natural world from the 'bite of iron' brought by the Dwarves. This environmental vision is further explored through the Entwives, who moved away to practice agriculture and gardening, creating a tension between wild nature and tamed cultivation.

Beyond environmentalism, the Ents function as a complex myth regarding the balance of life. The 'Song of the Ents and the Entwives' explores the dichotomy between the Ents' somnolent, passive contemplation and the Entwives' active, bursting vitality. Commentators suggest this serves as a cautionary tale: without a balance between the two, the Ents risk falling into 'apathetic isolationism' or 'somnolent oblivion.' This dynamic highlights a core theme in Tolkien's work—the necessity of balancing action and reflection to celebrate natural beauty.

The linguistic and cultural roots of the Ents are equally rich. The name 'Ent' is derived from the Old English word for 'giant,' borrowed from Anglo-Saxon poems describing Roman ruins. In Tolkien's invented Sindarin language, they are known as Onodrim. While they were once 'dumb' until taught to speak by Elves, they remain one of the oldest walking creatures in Middle-earth, embodying a primal, ancient power that only rouses when the forest is threatened.

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