<p>The siege of Tobruk was the longest in British military history. The coastal fortress and deep-water port was of crucial importance to the battle for North Africa, and the key that would unlock the way to Egypt and the Suez Canal. For almost a year the isolated garrison held out against all attempts to take it, and in the process Tobruk assumed a propaganda role that outweighed its great strategic value, becoming a potent symbol of resistance ...