An episode is seen in "Taiheiki" where Yoshisada threw a gold-forged sword into the sea at Inamuragasaki and prayed to the dragon god, the tide went out, the tideland appeared, allowing him to bulldoze through.
義貞が稲村ヶ崎で黄金造りの太刀を海に投じ竜神に祈願すると、潮が引いて干潟が現れて強行突破が可能になったという話が『太平記』などに見られる。