148:, is a group of military personnel or units that is initially not committed to a battle by its commander, so that it remains available to address unforeseen situations or exploit sudden opportunities. Reserves may be held back to defend against attack from other enemy forces, to be committed to the existing battle if the enemy exposes a vulnerability, or to serve as relief for troops already fighting. As reserves (especially in the defence) represent a "hedge against uncertainty", the size of the reserve depends on the level of uncertainty a commander has about the enemy's intentions. Some of the different categories of military reserves are:
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is not the reserve for a higher headquarters (though depending on the setup they may be). So if one of a battalion's companies is held in reserve during a battle, the company is considered to be a reserve for the battalion but not for the brigade or the division, since it is committed to action in
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doctrine states that a commander should reform another reserve after committing his existing reserve. Reserves can also be employed to relieve troops in action, allowing those units to rest and regroup away from the front line.
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Deciding where, how and especially when to employ reserves is a key command decision. In the event of reserves being sent forward to exploit a breakthrough, some are typically held back to deal with a potential
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during the First World War. The intended purpose of the army was to carry out the breakthrough phase of the Somme offensive once
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