After concentrating against Japan, Britain can accept more risk elsewhere in the campaign. The alliance with France makes Germany a lower immediate priority because French military strength is being maintained. Allied capacity substitutes for forces Britain would otherwise need to hold back. The scenario shows how alliances redistribute risk and permit concentration in a chosen theatre.
Notable Point · 2:12:18-2:12:38
Using an alliance to cover another theatre
The French alliance lets Britain concentrate against Japan while treating Germany as a lower immediate priority.