I think we have hardly seen the beginning of a powerful antiwar movement without precedent.

LONDON, March 2 -- The people who helped organize the largest worldwide peace demonstration in history last month say they are not through yet.

More than 120 activists from 28 countries emerged from an all-day strategy session here this weekend with plans not just to protest a prospective U.S.-led war against Iraq but to prevent it from happening. They want to intensify political pressure on the Bush administration's closest allies -- the leaders of Britain, Italy and Spain -- and force them to withdraw their support, leaving the United States, if it chooses to fight, to go it alone. And they intend to further disrupt war plans with acts of civil disobedience against U.S. military bases, supply depots and transports throughout Europe.

And I also think that the movement will not disappear even if the war does.

Organizers say they would like to find a way to channel the newfound enthusiasm and activism into a worldwide political movement. But they say the disparate nature of those participating would make such a movement difficult if not impossible.

"This was caused by social forces, and it's not something that organizations produced," said Andrew Burgin, a member of the coalition's British steering committee. "They're not in our control. . . . You don't lead a movement like this, the movement leads you."