If Britain secured Norway's ports before Germany

What happens if the Royal Navy takes Norway's major ports before the German invasion?

Germany faces a much harder invasion, while Norway enters a diplomatic crisis whose outcome depends on British restraint, timing, and the government's desire to avoid war.

German invasion forces would encounter Royal Navy destroyers, coastal troops, and artillery already controlling the key approaches. Britain planned to secure ports without disarming Norway or replacing its government, leaving Oslo with a politically ambiguous violation of neutrality rather than a straightforward conquest. The outcome would depend heavily on timing, local military cooperation, the Norwegian cabinet's indecision, and whether Britain could present its intervention as the action that stopped an immediate German invasion.