In this counterfactual, Yonai returns as prime minister on 18 July 1941, four days before the army's move into Indochina. Troops are already embarked, but his naval connections could help him learn their movements because the navy probably knew about the army's shipping plans. A sufficiently prompt signal might recall the transports. Using the navy to sink them would risk civil war and is treated as an unlikely intervention. The immediate question is whether his relationships and authority could produce an effective recall in four days.
Notable Point · 1:53:22-1:56:48
Could Yonai stop the Indochina deployment in four days?
The counterfactual installs Yonai on 18 July 1941, leaving only four days to halt the occupation of southern Indochina.