On September 9, 1942, the first bombing on the continental United States at Mount Emily, Oregon during WWII by Japanese planes took place. An excerpt from the article:
"I-25‘s fourth patrol sent the sub back to the Pacific Northwest. On September 9, 1942, Fujita launched the Glen aircraft carrying two 168-pound incendiary bombs. Their mission was to drop the bombs over the forested region along the Oregon/California border in an attempt to start devastating forest fires. The Japanese had also launched thousands of firebomb-loaded weather balloons with the same intention (some were discovered as far east as Michigan). One of Fujita’s bombs managed to land on Mount Emily, east of Brookings, Oregon, starting a small blaze. Due to wet conditions, and a rapid response from the U.S. Forest Service (his plane had been spotted during the attack), the fire, later dubbed the Lookout Air Raid, did little damage. Weeks later, I-25 launched the plane again for a less successful mission. Fujita reported seeing flames but the attack went unnoticed."