What happened in the Battle of Bardia in WW2?

The Battle of Bardia was fought over three days between 3rd and 5th of January 1941, as part of Operation Compass, the first military operation of the Western Desert Campaign of the Second World War. It was the first battle of the war in which an Australian Army formation took part, the first to be commanded by an Australian general and the first to be planned by an Australian staff. Major General Iven Mackay's 6th Division assaulted the strongly held Italian fortress of Bardia, Libya, assisted by air support and naval gunfire, and under the cover of an artillery barrage