Siege of Ulsan

First siege of Ulsan
	Part of the Imjin War
	; Joseon and Ming dynasty soldiers assault the Japanese-built fortress at Ulsan
Date	29 January – 19 February 1598
Location	Ulsan Japanese Castle, Ulsan, Southern Korean Peninsula
Result	Japanese Victory; Withdrawal of Korean and Ming Forces
Belligerents
Joseon and Ming dynasty	Japanese army
Commanders and leaders
Ming:; Yang Hao; Ma Gui ; Joseon:; Gwon Yul	Ulsan castle; Katō Kiyomasa; Asano Yoshinaga; Reinforcements; Mōri Hidemoto; Nabeshima Naoshige; Hachisuka Iemasa; Kuroda Nagamasa
Strength
Ming: 40,000; Joseon: 10,000	Ulsan castle: 10,000 – 23,000; Reinforcements: 13,000
Casualties and losses
1,621 killed; 2,908 wounded	~9,000 – 20,000+

The siege of Ulsan (Korean: 울산성 전투; Hanja: 蔚山城戰鬪; RR: Ulsanseong Jeontu) was an unsuccessful Ming-Joseon attempt to capture Ulsan from the Japanese. The siege lasted from 26 January to 19 February 1598.