COLOMBO (Reuters) -- Sri Lanka's civil war appeared to have resumed in all but name on Wednesday as Tamil Tiger rebels attacked three army camps and pushed into government territory and the military said dozens of rebels were killed. The truce declared in 2002 was the fourth time the two sides officially agreed to stop hostilities, and the longest period of peace since the Liberation Tigers of Tamil Eelam (LTTE) began their war for self-rule. A summary of peace efforts and ceasefires follows: 1983 -- War breaks out after riots against minority Tamils. 1987 -- India signs an accord with Sri Lanka on July 29 to help it disarm the rebels and initiate a political process aimed at lasting peace. -- The first formal cessation of hostilities begins on August 3. Indian peacekeepers arrive to monitor ceasefire. -- Ceasefire breaks down on Oct 5 when Tiger cadres attack army camps in north and kill 23 civilians in the east and 6 Indian peacekeepers. -- On Oct 9 India's Defence Minister orders the Indian Peace Keeping Force to attack the Tigers. 1989 -- President Ranasinghe Premadasa starts peace talks on April 25 with the LTTE, but fighting with the Indians continues. -- Rebels and peacekeepers agree to an informal truce on June 8 after Premadasa asks Indian troops to leave. 1990 -- LTTE agrees to a ceasefire on June 17, but breaks the truce the next day. 1995 -- President Chandrika Kumaratunga signs a formal ceasefire with reclusive rebel leader Velupillai Prabhakaran in January. -- Tigers break truce on April 19, attacking two naval gunboats in the eastern port of Trincomalee and killing 12 sailors. 2002 -- New Prime Minister Ranil Wickremesinghe signs a ceasefire agreement with Tiger rebels in February, starting the island's longest period of peace since 1983. 2005 -- Foreign Minister Lakshman Kadirgamar is assassinated in the garden of his Colombo home, an attack blamed on the rebels. 2006 -- The head of the Sri Lankan army, Lt Gen Sarath Fonseka, is injured in a suicide bomb attack in April. Deputy chief of staff Major-General Parami Kulatunga is killed by a suicide bomber in June. -- A top Tamil Tiger rebel leader tells Reuters on July 31 that the ceasefire is null and void and civil war is back on. The government says it remains committed to the truce, which truce monitors say now exists only on paper.