Metals　usually　have　three　crystal　structures:　face-centered　cubic　(fcc),　body-centered　cubic　(bcc),　and　hexagonal-close　packed　(hcp)　structures.　Typically,　metals　exhibit　only　one　of　these　structures　at　room　temperature.　Mechanical　processing　can　cause　phase　transition　in　metals,　however,　metals　that　exhibit　all　the　three　crystal　structures　have　rarely　been　approached,　even　when　hydrostatic　pressure　or　shock　conditions　are　applied.　Here,　through　in　situ　observation　of　the　atomic-scale　bending　and　tensile　process　of　similar　to　5　nm-sized　Ag　nanowires　(NWs),　we　show　that　bending　is　an　effective　method　to　facilitate　fcc-structured　Ag　to　access　all　the　above-mentioned　structures.　The　process　of　transitioning　the　fcc　structure　into　a　bcc　structure,　then　into　an　hcp　structure,　and　finally　into　a　re-oriented　fcc　structure　under　bending　has　been　witnessed　in　its　entirety.　This　re-oriented　fcc　structure　is　twin-related　to　the　matrix,　which　leads　to　twin　nucleation　without　the　need　for　partial　dislocation　activities.　The　results　of　this　study　advance　our　understanding　of　the　deformation　mechanism　of　small-sized　fcc　metals.