On the night of July 24, 1998, Alpha team was sent to the Arklay Mountains north-west of Raccoon City, in search of the S.T.A.R.S. Bravo team, who mysteriously disappeared. They soon discovered that most of Bravo was slaughtered by the monsters that were created by the Umbrella Corporation's t-Virus, and Alpha team were forced to spend the night trying to survive in the zombie- infested Spencer Mansion until the remaining members, along with the sole survivor of Bravo team; Rebecca Chambers, were rescued by helicopter pilot Brad Vickers. Joseph Frost was the only Alpha Team casualty during the Mansion Incident, although as of 2009, both Albert Wesker and Brad Vickers have also lost their lives.