I suspect the thirs and sixth photos, which appear to be of the same tank, are from WW2. The tank looks like it's a monument on a plinth, and was in a town taken over by the advancing Germans in 1941 or 1942.
I don't think the last one is a tank. Is it a pontoon or a bridge? Not even sure it's WWI.
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"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.