How an earlier British move might have denied Germany Norway

A British force reaching Norway first could have prepared the ports Germany needed for its invasion. Radar and entrenched garrisons would give the defenders warning and ready positions against arriving troops. The naval scenario places two Royal Navy flotillas, amounting to sixteen Tribal-class destroyers, in the path of the German ships. Problems with German submarine and destroyer torpedoes would further complicate an attack against that prepared force. The outcome depends on Britain arriving and establishing its defences before Germany attempts to land.