Norway possessed useful defensive works, but delayed mobilization left many of them without the people needed to fight. The government debated its response and eventually sent mobilization orders by telegram instead of immediately broadcasting a nationwide call when Denmark was attacked. A mobilized citizen force would have supplied commanders, deputies, NCOs, and local troops able to operate the system even if an individual leader hesitated. Fully crewed positions such as Oscarsborg and defended ports could have imposed catastrophic naval losses and disrupted the German invasion. Because the government never activated that threshold in time, German forces evaded the cost the fortifications were meant to impose.
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Norway had a defensive threshold but failed to mobilize it
Norway's campaign demonstrates that capable forts cannot deter an invasion when mobilization, crews, and political authorization are missing.