Hundreds of civilian deaths in the U.S.-led invasion of Iraq could have been prevented by abandoning two misguided military tactics. The use of cluster munitions in populated areas caused more civilian casualties than any other factor in the coalition´s conduct of major military operations in March and April. U.S. and British forces used almost 13,000 cluster munitions, containing nearly 2 million submunitions, that killed or wounded more than 1,000 civilians. International humanitarian law, or the laws of war, does not outlaw all civilian casualties in wartime. But armed forces are obliged to take all feasible precautions for avoiding civilian losses, and to refrain from attacks that are indiscriminate or where the expected civilian harm exceeds the military gain. The term “casualty” refers to both dead and wounded. This 147-page report also examines violations of international humanitarian law by Iraqi forces, including use of human shields, abuse of the Red Cross and Red Crescent emblems, use of antipersonnel landmines, and placement of military objects in mosques and hospitals. The Iraqi military´s practice of wearing civilian clothes also eroded the distinction between combatants and civilians.