What is the significance of malcom’s army carrying branches from birnam wood to the castle?

Question: What is the significance of Malcom’s army carrying branches from Birnam wood to the castle?

The witches predict Macbeth's army would be defeated only if Birnam wood comes to his castle. The army breaks off branches from the trees in Birnam wood and carries the branches with them as they march on Macbeth's castle. He will not be defeated until the Birnam wood marches to his castle.

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As they approach the castle, Malcolm and his army come to a wooded area known as Birnan Wood.  In order to camouflage their numbers and surprise Macbeth, Malcolm tells his soldiers to cut branches from the trees and to use them to shield themselves.

The significance of Malcolm's Act 5.4 approach to the Dunsinane Castle with tree branches is the ultimate demise of Macbeth, who believed he was invincible since the weird sisters had told him  he could never be overthrown until "Great Birnan wood to high Dunsinane hill/Shall Come". However, the sisters seemed to have referred only to the branches of the trees of Great Birnan coming to Dunsinane hill.

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