Iraqi security forces attempting to retake control of the western city of Ramadi were routed in heavy fighting Sunday, the worst defeat for Iraq’s central government since Islamic State militants stormed across the country last June.

In a replay of last year’s military debacle, elite units abandoned their U.S.-provided equipment to Islamic State fighters and fled the area, leaving several hundred soldiers surrounded in the last government-held enclave in the city.

Multiple security sources, none of whom agreed to be identified, speaking from both within the besieged Anbar Operations Center as well as with the units fleeing the city, described the fight for control of the capital of Iraq’s largest province as essentially over after reinforcements sent on Saturday to retake the city were crushed by Islamic State fighters. […]