The Wall Street Journal | Jonathan Spyer: The U.S. killed at least 25 Ktaib Hezbollah fighters on Sunday night in its first counterstrike in a decade against an Iran-aligned Iraqi Shia militia.

U.S. F-15E aircraft struck three sites in Iraq and two in Syria in retaliation for Ktaib�s Friday rocket attack, which killed an American contractor and wounded four U.S. service personnel.

The war against Islamic State in Iraq looks likely to be overshadowed by a growing confrontation between Iranian proxies and the roughly 5,200 U.S. troops in the country.

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