It's good that they taught them the old, tried and true method of millenia . . . that is known as "kedging," by the way. Almost all ships in the era of sail would have carried kedge anchors, at least two; their weight would simply have been calculated in the ballast. That one might never use them on a voyage is meaningless. When such a ship is run aground, there is no other way, reasonably, to pull her off, so having kedge anchors was a must.
Kedge anchors -- note the long handle attacked at the eye of the anchor (the eye is the ring at the top through which a line is passed to secure the anchor to the ship's capstan, a human-powered winch). In shoal water, the anchor would be loaded in a boat and carried to a likely spot. Were the water not too deep, someone would then go into the water, and lift handle attached to the anchor, and then this would be used to securely bury the anchor in the bottom.