Battlefield

Outside of Philippi lies a large plain. It was on this plain that the the Roman Republicans (Brutus and Cassius) fought the Roman Imperialists (Octavus and Anthony). The Roman Imperalists won, ending the Roman Republic and beginning the Roman empire.

How is this significant for understanding the world of Paul?

The military was a vital part of Philippi; many of its citizens were former soldiers in the Roman army.

How is Paul remixing his culture?

Paul uses military language in his letters, even calling one of his co-workers in Philippi a fellow solider.

Still, I think it necessary to send to you Epaphroditus-- my brother and co-worker and fellow soldier, your messenger and minister to my need;  Philippians, chapter 2:25)

The reality that the Roman military was an immediate and integral part of life may also explain Paul's choice of military language in his letters to the congregation in Ephesians and Thessalonians -- both of which were large cities which would have certainly seen a strong Roman military presence.  People would clearly understand the imagery.

Put on the whole armor of God, so that you may be able to stand against the wiles of the devil.  For our struggle is not against enemies of blood and flesh, but against the rulers, against the authorities, against the cosmic powers of this present darkness, against the spiritual forces of evil in the heavenly places. Therefore take up the whole armor of God, so that you may be able to withstand on that evil day, and having done everything, to stand firm.  Stand therefore, and fasten the belt of truth around your waist, and put on the breastplate of righteousness.  As shoes for your feet put on whatever will make you ready to proclaim the gospel of peace.  With all of these, take the shield of faith, with which you will be able to quench all the flaming arrows of the evil one. Take the helmet of salvation, and the sword of the Spirit, which is the word of God. (Ephesians, chapter 6:11-18).

But since we belong to the day, let us be sober, and put on the breastplate of faith and love, and for a helmet the hope of salvation. (1st letter to the Thessalonians, chapter 5:8)