When Satsuma invaded Ryukyu in the spring of 1609, Gusukuma's eldest son, Gusukuma Sapeechin Seizō (), joined the army led by Goeku Ueekata () which tried to block Satsuma troops at the Taihei bridge (). Seizō was shot by a "hinawajū" (or arquebus) and decapitated. Ryukyuan soldiers were shocked and fled.