 According to Morris during April the Haganah "had prepared and recorded six speeches, which were broadcast time and again by the Haganah's radio station and loudspeaker vans".They didn't call for Arab flight, but they "were designed to cause demoralisation—and the HGS\Operations proposed to 'exploit' this demoralisation (it didn't say how)".Khalidi illustrates the psychological warfare of the Haganah by the use of the Davidka mortar.