Usage: 3 forms in 8 verses
Form Translated As     In Verse(s)
ενωπλισμένοσ being armed LXX.Num.32.29
ενωπλισμένοι arming themselves LXX.Josh.6.7
being armed LXX.Num.31.5LXX.Num.32.27LXX.Num.32.30LXX.Num.32.32
ενοπλισάμενοι Arming yourselves LXX.Deut.3.18
arming ourselves LXX.Num.32.17

Liddell-Scott-Jones

ἐνοπλίζω (enoplizō) to arm oneself G:V

ἐνοπλίζω-ίζω,

adapt to.., ὠλέναις πλάτην [Refs 3rd c.BC+]

__II middle, arm oneself, [Refs 2nd c.AD+]:—passive, perfect participle -ωπλισμένος armed, [LXX+2nd c.AD+]

LSJ Scripture Refs: LXX.Exod.13.18