The death count from Tuesday's separate bombing attacks in Brussels continued to climb Thursday, with police reporting at least 34 dead and nearly 270 injuried. The atrocities are tragic and unacceptable. But the West should understand that this is what winning may look like in the battle against the Islamic State group. The attackers' coordinated strikes could well stem more from a sense of weakness, than strength.

Islamic State has recently taken a series of serious hits at its power and prowess. First, and most important, its territory in Iraq and Syria — the "caliphate" that has attracted foreign fighters from around the globe — has been steadily diminishing in size over the past 15 months, and the territorial losses are escalating. Since January 2015, the militant group has lost an estimated 22 percent of its territory in Iraq and Syria — with 8 percent of those losses in 2016.

This past month, a cache of thousands of Islamic State documents was leaked to the European media. In Arabic, the documents consisted of Islamic State member forms, including such biographical information as names, ages, education, skills and whether or not the individuals were still alive.