My favorite story of a WW1 veteran seeing service during WW2 is the 1919 vintage Mk V that was used to test the prototype Bailey bridge. They obviously weren't confident enough in the structure to risk a current model. The Mk V was trundled to the centre of the span, a further two unspecifed smaller tanks were driven on top using ramps. The Mk V was then crammed full of steel and pig iron. The bridge held.

Anyway what's this?