By Hook or by Crook

It is said that Strongbow, when debating with his followers on the best mode of capturing Ireland, said, that it must be taken "by Hook or by Crook." "*The Hook*" is the name of a well-known promontory, forming the N.E. boundary of Waterford Harbour; and *Crook-haven* is an equally well-known harbour, on the south coast. Could this have any thing to do with the proverb?