In the early 1980s, Hama had emerged as a major source of opposition to the Ba'ath government during the Sunni armed Islamist uprising, which had begun in 1976. The city was a focal point for bloody events in the 1981 massacre and the most notable 1982 Hama massacre. The most serious insurrection of the Syrian Islamic uprising happened in Hama during February 1982, when Government forces, led by the president's brother, Rifaat al-Assad, quelled the revolt in Hama with very harsh means. Tanks and artillery shelled the neighbourhoods held by the insurgents indiscriminately, and government forces are alleged to have executed thousands of prisoners and civilian residents after subduing the revolt, which became known as the Hama massacre. The story is suppressed and regarded as highly sensitive in Syria. The Hama Massacre led to the military term "Hama Rules" meaning the complete large-scale destruction of a military objective or target. The city was the site of conflict between the Syrian military and opposition forces as one of the main arenas of the Syrian civil war during the 2011 siege of Hama.