Former Prime Minister Tony Blair has said no amount of planning could have prepared Coalition troops for the bloodshed in the aftermath of Saddam Hussein's overthrow.
Britain's top general in Iraq, Lieutenant General Sir Graeme Lamb, earlier suggested post-war planning had been "pretty hopeless".
Speaking on the eve of the 10th anniversary of the Iraq War, Mr Blair told ITV News presenter Mark Austin the loss of life was "not because the planning wasn't right".
Mr Blair also said there is "a case for" arming opposition fighters in Syria, a country that he said was "disintegrating before our eyes".
On the eve of the tenth anniversary of the 2003 invasion, Iraq is still struggling with insurgents, deadly sectarian feuds and corruption.
Ali Hamdani reflects on Iraq war during which he risked his live on a daily basis to show the world "what was happening in my country".
Military blogs really came to prominence during the Iraq War as soldiers took to the internet to share their experience of the frontline.