There were numerous blockades and attempts at blockade running during the Peloponnesian War. Emphasis shifted to naval battles and strategies of attrition such as blockades and sieges. Blockades and protests continued through March in BC, Ontario and Quebec. Khublai Khan dealt with such threats by using both military blockades and economic sanctions. Both nations were exhausted by years of battles, bombings and blockades. This was cited as a retaliation for British minefields and shipping blockades. While shortages started due to naval blockades and hoarding, the prices of commodities soared. Actions such as blockades and sit-ins may also be referred to as demonstrations. Mahan emphasized that naval operations were chiefly to be won by decisive battles and blockades. Garrison duty and land blockades were the most common operations for both armies. Blockades and skirmishing continued meanwhile, and Grange continued to refortify the castle. Their apprehensions prompted over a dozen blockades throughout the city. They believed that universities should be dismantled by violence, such as university-wide blockades. Police officers were also injured in attempting to clear blockades. He ordered the construction of large blockades (levees) to block the path of the water.