We observed that metal dendrites exhibit a correlated response to applied mechanical loads (Figs. ). Results for a 90 µm thick LLZTO electrolyte disc are shown in Figure . A dendrite propagating under 0.2 mA/cm 2 current density (current divided by the initial Li metal electrode area) was subjected to 70 MPa applied compression, and then unloaded. The path of the dendrite under no applied load is highlighted in blue, while the segment propagated under load is highlighted in red. Micrographs with no highlighting are shown in the Supplemental Information. Upon loading, a clear deflection of the dendrite towards the loading axis is observed. Upon removal of the load, the dendrite turned back towards its original propagation direction. The tendency for dendrites to align with the applied load is consistent with the propagation of a pressurized crack. Continuous metal plating results in a pressure buildup within the metal protrusion. This results in a pressure on the flaw surface (𝑃𝑃 in Fig. ) which drives propagation. Compressive forces (i.e., 𝜎𝜎 𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎 in Fig. ) can act to close cracks, and inhibit propagation perpendicular to the axis of compression. So, under increased load, cracks should turn towards the axis of compression, consistent with the experimental finding in Fig. .