That spring day in 1945, Elsie Mitchell baked a chocolate cake for a church picnic, traveling with her husband, Archie, five children from their congregation, and a handful of other families. The plan was a sunny outing near Gearhart Mountain by Bly, Oregon, for picnicking and fishing.

As the Reverend parked and unloaded, the children sprinted toward Leonard Creek, with Elsie faithfully trailing. A child noticed something gray and secretive along the water’s edge and summoned the others closer. A single object was touched, and an enormous blast shattered the quiet of the forest.

Elsie Mitchell became the sole adult casualty of an enemy attack on the U.S. mainland during World War II, and all five children lost their lives as well. The cause was a series of Japanese balloon bombs—known as fu-go—constructed from mulberry paper and filled with hydrogen, released into the jet stream toward the war’s end, between late 1944 and early 1945. Each balloon carried several bombs intended to kill, ignite forest fires, and spread fear.

The government’s war-time policy instructed officials to keep the balloons quiet in the media to prevent panic and to convince Japan their efforts would fail. Ironically, Japan had already halted the program a month earlier, feeling their mission had proved fruitless. Yet the balloons had already reached North America, crossing oceans and skies in significant numbers. The Mitchell tragedy was reported without immediate detail, and public warnings about the bombs were delayed until the next month as authorities weighed what to reveal.

In total, 361 balloons were discovered across the U.S., Canada, and Mexico. Some did explode, but the overall damage remained minimal, and the Japanese miscalculated how rainy and resistant those Pacific Northwest forests would be to fires.

Today, a stone-and-bronze monument marks the site, about 13 miles northeast of Bly, commemorating the only confirmed mainland deaths of World War II. The scene preserves a somber memory of a family’s loss and a nation’s wartime vigilance.