 Despite the <unk> military success , the control of the <unk> remained contested . Pagan did not relinquish its claim to the frontier regions , and the <unk> , apparently taking advantage of <unk> <unk> elsewhere , rebuilt their forts at <unk> and <unk> later in <unk> , posting permanent garrisons commanded by <unk> <unk> . But their control was short @-@ lived . The Great Khan 's attention turned to Southeast Asia once more in 1281 . He had had mixed success : his <unk> forces had finished off the last of the Song in 1279 but had again failed to take Japan in 1281 . That year , the <unk> emperor sent another mission to Pagan , demanding tribute yet again . The <unk> king was to send his ten senior ministers accompanied by one thousand cavalry officers to the emperor 's court . ( With <unk> , the emperor summoned the king of <unk> himself to Beijing . ) 
