In 1989, Charles Taylor's National Patriotic Front of Liberia (NPFL) invaded Liberia from Côte d'Ivoire, where Bockarie was living at the time. However, Bockarie did not join until later that year, when he met recruits who were talking about taking action in Sierra Leone. He went with the group to join guerilla training exercises held along the border of Sierra Leone and Liberia. He was officially a part of the newly formed RUF in 1990, and was a part of the initial incursion into Sierra Leone in 1991.