Mr. Caron’s photographs of joyful, radiant students capture what made the unrest seem to some “a huge collective fiesta,” as the journalist Marc Kravetz once described it. But in his photographs of the turmoil in the Latin Quarter — armed riot police racing through the streets, students hurling projectiles through the air — Mr. Caron appears to be documenting nothing less than urban guerrilla warfare (much like this week’s May Day riots). In these photos, Mr. Caron’s experience as a combat photographer helped give his photos a cinematic immediacy and power that quickly made them among the most widely circulated at the time. The protests fizzled in June, President de Gaulle remained in power, and Mr. Caron moved on to other conflicts. In 1969, he photographed the troubles in Northern Ireland and the anniversary of the Prague spring in Czechoslovakia. In 1970, he was taken hostage for a month while covering the civil war in Chad with a group including Mr. Pledge. Just a few months after their release, Mr. Caron traveled to Cambodia, where, one day, he disappeared in Khmer Rouge-controlled territory, never to be seen again. He was 30.