1. A Plan Built on Coordination That Could Not Hold
Philip II's strategic concept required two moving parts to mesh perfectly: the fleet would sweep the Channel clear and then link up with the Duke of Parma's army waiting in the Spanish Netherlands, ferrying those troops across to England. The problem was that no deep-water port existed along that stretch of coast where the Armada could anchor safely, and communication between the fleet commander Medina Sidonia and Parma was slow, uncertain, and subject to misunderstanding. Neither commander had full authority over the other, and the shallow-draft boats Parma needed to move his men were vulnerable to Dutch flyboats patrolling inshore. The joint operation, on paper formidable, was operationally fragile from the start.
Why it matters: Understanding this flaw reframes the whole campaign: England did not so much defeat a sound plan as expose a plan that was always unlikely to succeed, which complicates the triumphalist story.