Yes, I vaguely remember that you were talking about the ship caulkers, the English ship builders who built the ships that were successful in averting the intended invasion of the Spanish Armada. The Spanish still agonize about their loss to Elizabeth I, but perhaps their land invasion will have a different result in moderns times. It will not be so easy later to deflect the relentless incursions of invaders, so the ships of yore might not be all that effective in future.