Interdiction need not destroy every shipment to change an opponent's operations. Each attack forces the enemy to protect other convoys and route them differently, imposing a penalty across the supply system. That burden constrains a land campaign dependent on maritime supply. The same logic applies to British pressure on Axis logistics in the Mediterranean and North Africa.
Notable Point · 4:47-5:08
Why disrupting some convoys affects every convoy
Even incomplete convoy interdiction forces an opponent to escort and reroute the rest of its traffic.