Its interesting how history is viewed.
From Wiki:
In total, therefore, 53 of the 133 aircrew who participated in the attack were killed, a casualty rate of almost 40 percent.
Initial German casualty estimates from the floods when the dams broke were 1,294 killed, which included 749 French, Belgian, Dutch and Ukrainian prisoners of war and labourers.
Later estimates put the death toll in the Möhne Valley at about 1,600, including people who drowned in the flood wave downstream from the dam.
Interestingly:
In 1977, Article 56 of the Protocol I amendment to the Geneva Conventions, outlawed attacks on dams “if such attack may cause the release of dangerous forces from the works or installations and consequent severe losses among the civilian population”
We don’t seem able to decide what to do when we wage war. Seems in some instances you can kill civilians, then later you cant and now for example we just call it collateral damage – kind of makes it easier to deal with I suppose.