LitCharts assigns a color and icon to each theme in Macbeth, which you can use to track the themes throughout the work.
Ambition
Fate
Violence
Nature and the Unnatural
Manhood
Summary
Analysis
In Birnam Wood, Malcolm walks with Macduff, Siward, Young Siward, and others Scottish and English lords. Malcolm gives orders that to hide the size of their army, all soldiers should cut a branch from a tree and hold it upright as they march.
The first block in Macbeth's fate falls into place: Birnam Wood will march on Dunsinane.