1 Chronicles 14 · a question people ask
What was the sound of marching in the treetops?
The chapter gives the sound as a signal and says what it means, not what made it. God says, "When you hear the sound of marching in the tops of the mulberry trees, then go out to battle; for God has gone out before you to strike the army of the Philistines" (14:15) (tap marching and mulberry trees). The sound tells David when to go, and the reason given is that God has gone out first. The chapter doesn't say who or what was marching, and it doesn't say which tree the mulberry trees were; this answer doesn't go past it. What it does say is that "David did as God commanded him" (14:16).
The verses
“When you hear the sound of marching in the tops of the mulberry trees, then go out to battle; for God has gone out before you to strike the army of the Philistines.” David did as God commanded him; and they attacked the army of the Philistines from Gibeon even to Gezer.”