At the Battle of Suruga Bay on March 15, 1580, the Izu navy deployed large atakebune with cannons.
The Takeda responded by deploying smaller warships and used the sandbanks as earthworks, bombarding the Izu ships from both land and water, before both were forced to withdraw at nightfall.
[1] Izu ship captains Kajiwara Kagemune and Yasuhide Shimizu each successfully defended Nagahama and Shimoda castle by 1590.
Kajiwara Kagemune attempted and failed to launch a naval attack, and Shimoda Castle was handed over after a siege of 50 days.
Most of the Izu suigun disbanded shortly afterward, and most sailors returned to land, though Kajiwara Kagemune fled to Mount Kōya.