Antiwar demonstrations prompted by the accelerated U.S. bombing in Southeast Asia draw somewhere between 30,000 to 60,000 marchers in New York; 30,000 to 40,000 in San Francisco; 10,000 to 12,000 in Los Angeles; and smaller gatherings in Chicago and other cities throughout the country. The new bombing campaign was in response to the North Vietnam’s massive invasion of South Vietnam in March. As the demonstrations were happening, bitter fighting continued all over South Vietnam. In the Mekong Delta, for example, the fighting was the heaviest it had been in 18 months.