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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