 Collins joined other IRB and IRA leadership in developing secret plans to launch a clandestine guerrilla war in the northeast.Some British arms that had been supplied to the Provisional government in Dublin were turned over by Collins to IRA units in the north.In May–June 1922 Collins and IRA Chief of Staff Liam Lynch organised an offensive that would involve mobilising and arming "both" pro- and anti-Treaty IRA units along the border area.