The Japanese attack on Pearl Harbor on December 7, 1941 lasted 110-minutes, from 7:55 am until 9:45 am. At 11:30 am, December 7, 1941, Governor Poindexter exercised his powers and “declare(d) and proclaim(ed) a defense period to exist throughout the Territory of Hawaiʻi.” Later that day, he placed the Territory of Hawaiʻi under martial law.
This was not the first proclamation of martial law in the Islands. On January 17, 1893, martial law was declared by the Provisional Government of the Hawaiian Islands. Then, on January 7, 1895, Republic of Hawaiʻi President Sanford B Dole declared martial law; it lasted until March 18, 1895.