After almost four years of negotiations and over 50 years of war, Colombia’s rebel FARC group and the government finally signed a peace accord in Havana, Cuba, late Wednesday.

“We won the most beautiful of all battles: Peace,” said the rebel group’s top negotiator, Iván Márquez.

“The war is over,” the Guardian quotes Humberto de la Calle, chief government negotiator, as saying after signing the deal. “It is the time to give peace a chance.”

“Today marks the beginning of the end of the suffering, the pain and the tragedy of the war,” Colombia President Juan Manuel Santos said in an address to the nation after the announcement in Havana.

Colombia’s government will hold a plebiscite on October 2 for citizens to either accept or reject the agreement.

“It’s in your hands, of all Colombians, to decide with your vote to support this historic accord that puts an end to this long conflict between the children of the same nation,” Santos said, according to the Associated Press.

The terms of the accord are not necessarily approved of by all Colombians, the Guardian reports:

“That point is at the center of controversy surrounding the accords,” the newspaper notes. “Critics say the accord should be renegotiated to include jail time for crimes against humanity and a ban on those convicted of such crimes from holding public office.”

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Polls show the plebiscite vote is currently tied between those in favor of the deal and those opposed.

The peace accord has been negotiated since November 2012. A draft of the agreement’s terms was released last fall, and the official signing of the deal follows a historic ceasefire declared in July.

The last serious attempt at a peace accord in the 1980s failed when right-wing death squads gunned down 3,000 members of a pro-FARC party, NPR notes.

The U.S. has long fought the FARC in Colombia, even going so far as to fund right-wing death squads under the Clinton administration in the 1990s, and in recent years helped Colombia’s right-wing government “torture, spy on, and kill” FARC rebels, a 2013 Washington Post investigation revealed.