In time, the Baloch nationalist insurgency erupted and sucked the armed forces into the province, pitting the Baloch tribal middle classes against Islamabad. The sporadic fighting between the insurgency and the army started in 1973 with the largest confrontation taking place in September 1974 when around 15,000 Balochs fought the Pakistan Army, Navy and the Air Force. Following the successful recovery of ammunition in the Iraqi embassy, shipped by both Iraq and Soviet Union for the Baluchistan resistance, Naval Intelligence launched an investigation and cited that arms were smuggled from the coastal areas of Balochistan. The Navy acted immediately, and entered the conflict. Vice-Admiral Patrick Simpson, commander of Southern Naval Command, began to launch a series of operations under a naval blockade.