Incendiary and High Explosive Bombs dropped on Dresden, Hamburg and Leipzig in Thousands of Tons. HE is High explosive, and IB is Incendiary bombs. The chart shows that Dresden was hit with 1.82 thousand tons IB and 5.28 thousand tons HE, Hamburg with 3.85 thousand IB and 4.37 thousand HE, and Leipzig with 2.13 thousand IB and 2.24 thousand tons of HE.