The AS90 - used last night in Iraq - is one of the most awesome battlefield artillery guns in the world. When the self-propelled howitzer was introduced in 1993, the first new field gun for three decades, military experts said it would revolutionise the use of artillery in the theatre of war. With a 155mm gun and an automated loading system, the AS90 Braveheart can deliver a payload of a quarter of a ton on to a single target in less than 10 seconds. Resembling a tank, the gun is engine-driven and can be positioned anywhere on the battlefield and...