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In page M4 Sherman:

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However, while this may have held true compared with the first generation German tanks, such as the Panzer III and Panzer IV, comparative testing with the second generation wide-tracked German tanks (Panther and Tiger) conducted by the Germans at their Kummersdorf testing facility, as well as by the U.S. 2nd Armored Division, proved otherwise; partly from their use of the characteristic Schachtellaufwerk interleaved and overlapped roadwheels (as used on pre-war origin German halftrack vehicles), especially over muddy or other unfavorable terrain. Lieutenant Colonel Wilson M. Hawkins of the 2nd Armored Division wrote the following comparing the U.S. M4 Sherman and German Panther in a report to Allied headquarters: