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Even in sea battles where large chongtong called cheon, ji, hyeon, hwang would seem more appropriate to employ, individual firearms had a role to play. Seungja-chongtong, being designed to fire multiple iron balls like shotguns, were improved to extend their range. They evolved into firearms similar to matchlock muskets, bringing soseungja-chongtong onto the stage. The topic of this episode is soseungja-chongtong, which were different from seungja-chongtong in how they were held and fired.