1. All combat is tiring. Especially hand-to-hand combat with armor and shields. Archers did not tire more than most of the other troops on the battlefield imho, perhaps even less.
2. Could someone give the exact quote from Polybios about the mutilated Macedonians? I only know a quote from Livius/Livy about the terror the Macedonians felt at the burial of soldiers who were cut to pieces by Roman swords. But these were victims of a Roman cavalry attack, so there would be no contradiction to the "stabbing legionary".
However, I think also the legionaries sometimes used their swords in a slashing manner, after the rows were broken, in single combat and against helpless enemies for example. The findings at Maiden Castle could be mentioned (although that might have been no Roman attack).
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