The war we are in is to establish ownership of physical earth

Eph 1:9-14

9 having made known to us the mystery of His will, according to His good pleasure which He purposed in Himself,

10 that in the dispensation of the fullness of the times He might gather together in one all things in Christ, both which are in heaven and which are on earth—in Him.

11 In Him also we have obtained an inheritance, being predestined according to the purpose of Him who works all things according to the counsel of His will,

12 that we who first trusted in Christ should be to the praise of His glory.

13 ¶ In Him you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also, having believed, you were sealed with the Holy Spirit of promise,

14 who is the guarantee of our inheritance until the redemption of the purchased possession, to the praise of His glory.