The invasion Attack of Anjouan ( code-named Operation `` Democracy in Comoros '' ) , on25 March 2008 , was an amphibious assault Attack led Causation by the Comoros , backed by African Union ( AU ) forces , including troops from Sudan , Tanzania , Senegal , along with logistical support Supporting from Libya and France .

The objective Aiming of the invasion Attack was to topple Change_of_leadership Colonel Mohamed Bacar 's leadership in Anjouan , an island in the Union of Comoros , when he refused Agree_or_refuse_to_act to step down Change_of_leadership after a disputed 2007 election Change_of_leadership , in defiance Agree_or_refuse_to_act of the federal government and the AU .

The storm caused Causation an estimated AU $ 3.5 billion ( US $ 3.6 billion ) in damage , making it the costliest tropical cyclone Catastrophe to hit Attack Australia on record ( not accounting Causation for inflation ; otherwise , Cyclone Tracy was costlier ) .

Early estimates of damage put Causation the cost Cost at about AU $ 100 million .

At least 75 % of the banana crop was destroyed Destroying , and damage to the sugar cane farms was expected to cost Cost about AU $ 500 million .