Most notable is the Blockade of Germany. Essentially, the UK and France conducted a naval blockade in order to restrict the amount of supplies, weapons, and food Germany could receive, hoping to weaken them into surrender.
None of the others were very significantly used during WWII, if at all.
My father actually fought in the war and he say they would throw tear gas and grenades in the tunnels and if there would be a blockade they would use motors
