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In page Code duello:

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Typical weapons were cased dueling pistols, tuned for identical appearance, reliability and accuracy. In America, the Irish code eventually supplanted the usual method of brutal hand-to-hand combat and gave the combat a respectable feel. However, since the combatants could not control guns as precisely as swords, gun duels had a greater chance of being fatal.[citation needed] Some duels miscarried because both opponents did not hear or see the starting signal. Agreeing to a signal was helpful.