Armed struggle against the Portuguese began in March 1962 with an abortive attack by PAIGC guerrillas on Praia. Guerrilla warfare was largely concentrated to the mainland Guinea, however, as logistical reasons prevented an armed struggle on the Cape Verde islands. On the Cape Verde islands PAIGC worked in a clandestine manner. After being nearly crippled militarily, Amílcar Cabral ordered that sabotage be the PAIGC's main weapon until military strength could be regained. On 23 January 1963 the PAIGC started the Guinea-Bissau War of Independence by attacking a Portuguese garrison in Tite. Frequent attacks in the north also took place. In that same month, attacks on police stations in Fulacunda and Buba were carried out not only by the PAIGC but also by the FLING.