Island Protection Tactics(海島入保策) during the Period of the War against Mongol was carried out for the first time in Seohaedo(西海道) and Bukkye(北界) of Goryo dynasty in 1231. The strategic experience of Haedoibbo(海島入保) that had been executed in these provinces had an considerable effect on the governments’ escape led by King into the Kanghwa island(江華遷都) in 1232.
Island Protection Tactics that was propelled in Seohaedo and Bukkye in the Period of the War against Mongol, have several military characters distinguished with southern provinces of Yanggwangdo(楊廣道).
The first, Haedoibbo in Seohaedo and Bukkye had come true throughout intensive military control of Choi Woo’s political power, from the start.
The second, Juhyunmin(州縣民) who had entered to strategic islands of Bukkye, could come back to the homeland in 1261. They defended strategic islands from Mongol invasion, staying to designated islands for a long time.
The third, Byeolchogun(別抄軍) that had stationed to strategic islands of Seohaedo, won to all naval battles against Mongol navy. As a result, Juhyunmin and defensive forces of strategic islands, prevented from Mongol navy’s coastal infiltration toward Kanghwa island.
The fourth, Gyungbyeolcho(京別抄) dispatched to main strategic islands of Bukkye. Forward stationing of this unit strengthened defensive power of strategic islands of Bukkye. The fifth, Bukkyebyungmasayeong(北界兵馬使營) had been moved to strategic islands of Seohaedo and Bukkye in the end of the War against Mongol.