http://rss.nytimes.com/c/34625/f/640350/s/3b845673/sc/24/l/0L0Snytimes0N0C20A140C0A60C150Cworld0Cmiddleeast0Crebels0Efast0Estrike0Ein0Eiraq0Ewas0Eyears0Ein0Ethe0Emaking0Bhtml0Dpartner0Frss0Gemc0Frss/story01.htm

The group’s sweep into Mosul and farther south appeared to catch many Iraqi and U.S. officials by surprise, but the gains were the realization of a yearslong strategy of state-building.

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