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A model is proposed to explain the formation of slip lines in irradiated copper crystals during the propagation of the Lüders front. In this model it is shown that, due to the sweeping up of the irradiation produced defect clusters by deformation, the critical stress to produce a slip line is that required to operate the source in producing the first dislocation loop in the environment of the defect clusters. As the slipped area expands a pile‐up forms and the stress required to expand this pile‐up falls. Since on this scale a normal tensile machine is soft, i.e. the load is constant, the pile‐up rapidly increases in size and velocity and hence slip lines should form very quickly. This has been verified by high‐speed photography. The sweeping up of the damage by deformation has also been verified experimentally. The model has important consequences for “source” and “lattice” hardening. It is shown that the lattice hardening of the dispersed defects produces all the characteristics of the deformation which have formerly been used as evidence of “source” hardening.