Operation Crossroads was a pair of nuclear weapon tests Testing conducted Action by the United States at Bikini Atoll in mid-1946 .

The Crossroads tests were the first of many nuclear tests held Hold in the Marshall Islands , and the first to be publicly announced Expressing_publicly beforehand and observed Perception_active by an invited audience , including a large press corps .

Planners attempted to protect Defending participants in the Operation Crossroads tests against radiation sickness , but one study showed Protest that the life expectancy of participants was reduced Cause_change_of_position_on_a_scale by an average of three months .

The Battle Hostile_encounter of Glendale , also known as the Battle Hostile_encounter of Frayser 's Farm , Frazier 's Farm , Nelson 's Farm , Charles City Crossroads , New Market Road , or Riddell 's Shop Commerce_buy , took place Process_start on June 30 , 1862 , in Henrico County , Virginia , on the sixth day of the Seven Days Battles Hostile_encounter ( Peninsula Campaign ) of the American Civil War Hostile_encounter .

It was the third series of American tests , following Trinity in 1945 and Crossroads in 1946 , and preceding Ranger .

Like the Crossroads tests , the Sandstone tests were carried out Action at the Pacific Proving Grounds , although at Enewetak Atoll rather than Bikini Atoll .