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I've just recently read how in Yom Kippur war Egyptians breached Israel's "impenetrable" line of fortifications on the banks of Suez channel, whose main part were 20 m high earth barriers to prevent landing. However, as they happened to be made of sand and sandy soil, Egyptians used high-power water cannons to simply flush down the sand and in ~2 hours opened huge holes through which they entered.

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