to pile arms

Pile \Pile\, v. t. [imp. & p. p. {Piled}; p. pr. & vb. n.
   {Piling}.]
   1. To lay or throw into a pile or heap; to heap up; to
      collect into a mass; to accumulate; to amass; -- often
      with up; as, to pile up wood. "Hills piled on hills."
      --Dryden. "Life piled on life." --Tennyson.
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            The labor of an age in piled stones.  --Milton.
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   2. To cover with heaps; or in great abundance; to fill or
      overfill; to load.
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   {To pile arms} {To pile muskets} (Mil.), to place three guns
      together so that they may stand upright, supporting each
      other; to stack arms.
      [1913 Webster] Pileate