Usage: 5 forms in 18 verses
Form Translated As     In Verse(s)
αρχιστρατηγού commander-in-chief LXX.Dan.8.11
αρχιστρατήγω his commander-in-chief LXX.1Sam.14.50
αρχιστρατήγου commander-in-chief LXX.1Sam.12.9
αρχιστράτηγοσ am commander-in-chief LXX.Josh.5.14
commander-in-chief LXX.Gen.21.22LXX.Gen.21.32LXX.Gen.26.26LXX.Josh.5.15LXX.2Sam.2.8LXX.2Sam.10.16LXX.1Kgs.2.22LXX.1Chr.19.16LXX.1Chr.27.34
his commander-in-chief LXX.1Sam.26.5
αρχιστράτηγον commander-in-chief LXX.1Kgs.2.32LXX.1Kgs.2.32LXX.1Chr.19.18
his commander-in-chief LXX.2Sam.10.18

Liddell-Scott-Jones

ἀρχιστράτηγος (archistratēgos) commander-in-chief G:N-M

ἀρχιστράτηγος-στράτηγος [], ,

commander-in-chief, [LXX+1st c.AD+]

LSJ Scripture Refs: LXX.Josh.5.15