What defensive feature was used in Rajput forts to protect gates from battering by enemy war elephants?

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1. Rajput forts were attacked by war elephants that tried to break gates.
2. They fitted **iron spikes** on the outer face of the gates.
3. The spikes hurt the elephants and stopped them from pushing the gate.
4. This made it hard for attackers to batter the gate open.

FINAL_ANSWER: b

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