 Koxinga 's grandson Zheng <unk> was rewarded by the Qing Emperor with the title " Duke of <unk> " ( <unk> ) and he and his soldiers were inducted into the Eight Banners . The Qing used Koxinga 's former rattan shield troops ( <unk> ) <unk> who were placed in the Eight Banners against Russian Cossacks at <unk> . 
