Ridiculous question. The M1 Abrams as a battlefield tank, is faster, more agile, and more accurate than a M109 howitzer. Both weapon systems have very different missions, and while the delivery system of the Abrams is exceptional, which would give it a head to head advantage, it does not fire the same ordinances as the M109, which has potentially far greater destructive power over greater distances.
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The elephant would win.
obviously army to army Persians would win by tactics but one to one a barbarian would win
raiden would win
Brock Leasnar would win
John cena would win in a fist fight an 50 cent would win in a in a gun fight