1969
    * June 18-22 - Students for a Democratic Society SDS National Convention held in Chicago, Illinois. Publication of "Weatherman" founding statement. Members seize control of SDS National Office.
    * July - Members Bernardine Dohrn, Eleanor Raskin, Dianne Donghi, Peter Clapp, David Millstone and Diana Oughton travel to Cuba and meet representatives of the North Vietnamese and Cuban governments.
    * August - Weatherman member Linda Sue Evans travels to North Vietnam. Weatherman activists meet in Cleveland, Ohio, in preparation for "Days of Rage" protests scheduled for October, 1969 in Chicago.
    * September 3 - Female members participate in a "jailbreak" at South Hills High School in Pittsburgh, Pennsylvania, where they run through the school shouting anti-war slogans and distributing literature promoting the "National Action." The term "Pittsburgh 26" refers to the 26 women arrested in connection with this incident.
    * September 24 - A group of members confront Chicago Police during a demonstration supporting the "National Action," and protesting the commencement of the Chicago Eight trial stemming from the 1968 Democratic National Convention.
    * October 5 - The Haymarket Police Statue in Chicago is bombed; Weathermen later claim credit for the bombing in their book, Prairie Fire.
    * October 8-11 - The "Days of Rage" riots occur in Chicago, damaging a large amount of property. 287 Weatherman members are arrested, some become fugitives when they fail to appear for trial in connection with their arrests.
    * November 8th - Sniper attack on Cambridge Police Station. Two shots were fired. Two Weathermen, James Kilpatrick and James Reaves, were indicted and then subsequently released when a witness recanted his testimony.
    * November-December - Karen Ashley and Phoebe Hirsch were among the few Weatherman members to join the first contingent of the Venceremos Brigade (VB) that departs for Cuba to harvest sugar cane.
    * December 6 - Bombing of several Chicago police cars parked in a precinct parking lot at 3600 North Halsted Street, Chicago. The WUO claims responsibility in Prairie Fire, stating it is a protest of the fatal police shooting of Illinois Black Panther Party leaders Fred Hampton and Mark Clark on December 4, 1969.
    * December 27-30 - Weathermen hold a "War Council" in Flint, Michigan, where plans are finalized to change into an underground organization that will commit strategic acts of sabotage against the government. Thereafter they are called "Weather Underground Organization" (WUO).
1970
    * January - Silas and Judith Bissell placed a home-made bomb under the steps of the R.O.T.C. building. The bomb was made from an electric blasting cap, an alarm clock, a battery and a plastic bag filled with gasoline and explosives.
    * February - The WUO closes the SDS National Office in Chicago, concluding the major campus-based organization of the 1960s. The first contingent of the VB returns from Cuba and the second contingent departs. By mid-February the bulk of the leading WUO members go underground.
    * February 16: A bomb is detonated at the Golden Gate Park branch of the San Francisco Police Department, killing one officer and injuring a number of other policemen (one seriously). No organization claims credit for either bombing. (See San Francisco Police Department Park Station bombing.)
    * On February 21, the house of Judge Murtagh, who presides over the Panther 21 trial, is fire-bombed by a WUO cell in New York City. The same night, molotov cocktails were thrown at a police car in Manhattan and two military recruiting stations in Brooklyn.
    * March - Warrants are issued for several WUO members, who become federal fugitives when they fail to appear for trial in Chicago.
    * March 6 - WUO members Theodore Gold, Diana Oughton, and Terry Robbins are killed in the Greenwich Village townhouse explosion, when a nailbomb they were constructing detonates. The bomb was intended to be planted at a non-commissioned officer's dance at Fort Dix, New Jersey.
    * March 30 - Chicago police discover a WUO "bomb factory" on Chicago's north side.
    * April 1 - Based on a tip Chicago Police find 59 sticks of dynamite, ammunition, and nitro glyerine in an apartment traced to WUO members. The discover of the WUO weapons cache ends WUO activity in this city.
    * April 2 - A federal grand jury in Chicago returns a number of indictments charging WUO members with violation of federal anti-riot laws. Also, a number of additional federal warrants charging "unlawful flight to avoid prosecution" are returned in Chicago based on the failure of WUO members to appear for trial in local cases. (The Anti-riot Law charges were later dropped in January, 1974.)
    * April 15 - The FBI arrests WUO members Linda Sue Evans and Dianne Donghi in New York with the help of WUO infiltrator, Larry Grathwohl.
    * May 10 - The National Guard Association building in Washington, D.C. is bombed.
    * May 21 - The WUO releases its "Declaration of a State of War" communique under Bernardine Dohrn's name.
    * June 6 - In a letter, the WUO claims credit for bombing of the San Francisco Hall of Justice, although no explosion has occurred. Months later, workmen locate an unexploded bomb.
    * June 9 - The New York City Police headquarters is bombed by Jane Alpert and accomplices. Weathermen state this is in response to "police repression." The bomb made with ten sticks of dynamite exploded in the NYC Police Headquarters. The explosion was preceded by a warning about six minutes prior to the detonation and subsequently by a WUO claim of responsibility.
    * July 23 - A federal grand jury in Detroit, Michigan, returns indictments against thirteen WUO members and former WUO members charging violations of various explosives and firearms laws. (These indictments were later dropped in October, 1973.)
    * July 25 - The United States Army base at The Presidio in San Francisco is bombed on the 11th anniversary of the Cuban Revolution. On the same day, a branch of the Bank of America is bombed in New York.
    * July 28 - Bank of America HQ in NYC is bombed around 3:50 AM. WUO claims responsibility.
    * September 15 - The WUO helps Dr. Timothy Leary escape from the California Men's Colony prison.
    * October 8 - Bombing of Marin County courthouse. WUO states this is in retaliation for the killings of Jonathan Jackson, William Christmas, and James McClain
    * October 10 - A Queens traffic-court building is bombed. WUO claims this is to express support for the New York prison riots.
    * October 11 - A Courthouse in Long Island City, NY is bombed. An estimated 8 to 10 sticks of dynamite are used. A warning was given around 10 min. prior to the 1:23 AM blast by the WUO.
    * October 12 - Around October 12 eight bomb explosions occur, Five in Rochester New York, Two in NYC, and One in Orlando FL. Despite WUO bomb warnings three persons are injured.
    * October 14 - The Harvard Center for International Affairs is bombed by The Proud Eagle Tribe of Weather (later renamed the Women's Brigade of the Weather Underground). WUO claims this is to protest the war in Vietnam. The bombing was in reaction to Angela Davis' arrest and was the first action undertaken by an all-women's unit of WUO.
    * October - Bernardine Dohrn, Katherine Ann Power, and Susan Edith Saxe were put on the FBI's Ten Most Wanted List
    * December - Fugitive WUO member Caroline Tanker, who fled the country for Cuba, is arrested by the FBI in Pittsburgh, Pennsylvania.
    * December 5th - Five Weatherman are captured for trying to bomb First National City Bank of NY and other buildings on the anniversary of the death of Fred Hampton. These individuals subsequently plead guilty.
    * December 11th - Vivian Bogart and Patricia Mclean from the WUO are arrested after throwing an incendiary bomb at the Royal National Bank in NYC around 1:30 AM.
    * December 16 - Fugitive WUO member Judith Alice Clark is arrested on the Days of Rage indictments by the FBI in New York.]