A pitched battle or set piece battle is a battle where both sides choose to fight at a chosen location and time and where either side has the option to disengage either before the battle starts, or shortly after the first armed exchanges.
A pitched battle is not a chance encounter such as a skirmish or meeting engagement, where one side is forced to fight at a time not of their choosing such as happens in a siege. For example, the first pitched battle of the English Civil War, the Battle of Edgehill, was fought when the Royalists chose to move off an escarpment to a less advantageous position so that the Parliamentarians would be willing to fight. In contrast the Battle of Gettysburg, fought during the American Civil War, started by chance as a skirmish, but as both generals chose to reinforce their positions instead of disengaging, they turned what was initially a skirmish into a pitched battle.
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