The escalation ladder begins with Birmingham seizing a Japanese liner as compensation. Japan then attacks the cruiser to recover the ship, giving Britain a clearer political and military case for striking Akagi. The carrier remains exposed near Hainan for several days, so the Royal Navy has time to connect the incidents and organize a response. Each side can still describe its action as a limited reprisal. Successive choices turn those reprisals into a wider naval war.
Notable Point · 23:56-26:00
Retaliation after Birmingham is attacked
A Japanese attack on Birmingham during a liner seizure supplies a more credible trigger for a British decision to sink Akagi.