The newspapers are predictably filled with articles about how 52 U.S. soldiers died in Iraq last month – the highest toll since September. Iraqi civilian casualties are also said to be at the highest level since August. These losses are being used to cast aspersions on claims of progress in Iraq.

Even one death is too many and 52 deaths is tragedy multiplied 52-fold. But let's keep some perspective. As the icasualties.org website makes clear, for better or worse, April was still one of the lighter-casualty months during the long war in Iraq.

More important, casualties cannot be looked at in a vacuum. A spike in casualties could be a sign that the enemy is gaining strength. Or it could be a sign that tough combat is under way that will lead to the enemy's defeat and the creation of a more peaceful environment in the future.

The latter was certainly the case with the casualty spike during the summer of 2007. (More than a hundred soldiers died each month in April, May and June.) Those losses were widely denounced as evidence that the surge wasn't working, but in fact they were proof of the opposite.

At the time, troops were engaged in hard fighting as part of Operation Phantom Thunder that eventually cleared most terrorists out of Anbar, Baghdad, Diyala, Babil and other provinces, leading to dramatic reductions in violence over the last year (more than 80% before the recent fighting).