The truth is starting to emerge about a recent Russian attack on U.S. forces in eastern Syria, and it deserves more public attention. The assault looks increasingly like a botched attempt to bloody the U.S. and intimidate President Trump into withdrawing from Syria once Islamic State is defeated. The U.S. military won this round, but Vladimir Putin’s forces will surely look for a chance at revenge.

Here’s what we know. Several hundred men and materiel advanced on a U.S. Special Forces base near Deir al-Zour on the night of Feb. 7-8. Pentagon spokeswoman Dana White confirmed soon afterward that the “battalion-sized unit formation” was “supported by artillery, tanks, multiple-launch rocket systems and mortars.” U.S. forces responded in self-defense “with a combination of air and artillery strikes.”

Ms. White wouldn’t confirm how many attackers were killed or who was fighting, though the U.S. had “observed” the military buildup for a week. Defense Secretary James Mattis called the confrontation “perplexing,” adding that “I have no idea why they would attack there, the forces were known to be there, obviously the Russians knew.” He’s referring to the U.S.-Russia “deconfliction” agreement in which the Russians agreed to stay west of the Euphrates River.

Now we’re learning that Russian fighters were killed in the attack, and Lebanese Hezbollah was also involved. The Kremlin has tried to cover up the deaths, but that’s getting harder as the body bags come home and Russian social media spread the word. The Foreign Ministry finally admitted Tuesday that “several dozen” Russians were killed or wounded but claimed that “Russian service members did not take part in any capacity and Russian military equipment was not used.”

That depends on how you define “Russian military.” Evidence is growing that the attack was orchestrated by Yevgeny Prigozhin, the Russian oligarch who does much of Mr. Putin’s dirty work. His businesses include the Internet Research Agency, a media operation indicted by a federal grand jury last week for meddling in the 2016 U.S. election.