Of the 3,636 Japanese in the garrison, only one officer and sixteen enlisted men surrendered. Of the 1,200 Korean laborers brought to Tarawa to construct the defenses, only 129 survived. All told, 4,690 of the island's defenders were killed. The 2nd Marine Division suffered 894 killed in action, 48 officers and 846 enlisted men, while an additional 84 of the wounded survivors later succumbed to what proved to be fatal wounds. Of these, 8 were officers and 76 were enlisted men. A further 2,188 men were wounded in the battle, 102 officers and 2,086 men. Of the roughly 12,000 2nd Marine Division marines on Tarawa, 3,166 officers and men became casualties. Nearly all of these casualties were suffered in the 76 hours between the landing at 0910 November 20 and the island of Betio being declared secure at 1330 November 23.