The soldiers need to arm up before they head out.
arm up
idiomto supply, or be supplied with, arms (weapons)
As tensions rose along the border, the local militia decided to arm up to protect their village.
Fearing an imminent invasion, the government ordered the border guards to arm up and prepare for a long defensive struggle.
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an arm and a leg
Usually used after the verb cost, but also often charge, pay, and spend: a very high price for an item or service; an exorbitant price
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arm candy
An attractive, seemingly romantic companion who accompanies a person in public solely so that one or both of the individuals can gain attention, enhance social status, or create an impression of sexual appeal.
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arm to the teeth
To equip thoroughly with weapons.
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Chalk Farm
[Cockney slang]arm
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long arm
Influence; far-reaching power.
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long arm of the law
The influence or effectiveness of law enforcement institutions; law enforcement officers collectively.
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take someone's arm
To take hold of someone by their arm; to link arms with someone.