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Read about MR-1: The Four-Inch Flight:

“The expected blast momentarily churned the air around launch complex No. 56. But then the roar stopped as suddenly as it had started. Watching by periscope from the blockhouse, the startled engineers saw the booster wobble slightly on its pedestal and settle back on its fins after, at the very most, a four- or five-inch liftoff…” (history.nasa.gov)