The Dade Massacre was a pivotal event that occurred on December 28, 1835, when a group of U.S. Army soldiers, led by Major Francis L. Dade, was ambushed by Seminole warriors in Florida. This confrontation marked the beginning of the Second Seminole War and highlighted the tensions between the United States government and the Seminole people regarding land and sovereignty, which ultimately led to broader Indian removal policies across the nation.