Usage: 3 forms in 6 verses
Form Translated As     In Verse(s)
μαχίμων for combat LXX.Josh.5.6
of combative LXX.2Kgs.19.25
μαχίμου being combative LXX.Prov.21.19
μάχιμοι for combat LXX.Josh.6.7LXX.Josh.6.9
ones for combat LXX.Josh.6.13

Liddell-Scott-Jones

μάχιμος (machimos) combat G:A

μάχιμος-ος [], η, ον,

also ος, ον [Refs 5th c.BC+]: (μάχη):— fit for battle, warlike, ἐπειδὴ μ. εἶ since you're a fighting man, [Refs 5th c.BC+] [same place]; τὸ μ. the effective force, [Refs 5th c.BC+]; τὸ μ. (i.e. ἔθνος) [Refs 5th c.BC+]; especially in Egypt, οἱ μ. τῶν Αἰγυπτίων the warrior caste, [Refs 5th c.BC+]; so later, of native troops, frequently in Papyrus, [Refs 2nd c.BC+]: superlative -ώτατος [Refs 5th c.BC+]. adverb -μως [Refs 2nd c.AD+]

__2 = {μαχιμώδης}, [Refs]
__II disputable, [Refs 2nd c.AD+]